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< title > regex_search< / title >
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< div class = "titlepage" > < div > < div > < h3 class = "title" >
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< a name = "boost_regex.ref.regex_search" > < / a > < a class = "link" href = "regex_search.html" title = "regex_search" > regex_search< / a >
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< / h3 > < / div > < / div > < / div >
< pre class = "programlisting" > < span class = "preprocessor" > #include< / span > < span class = "special" > < < / span > < span class = "identifier" > boost< / span > < span class = "special" > /< / span > < span class = "identifier" > regex< / span > < span class = "special" > .< / span > < span class = "identifier" > hpp< / span > < span class = "special" > > < / span >
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< / pre >
< p >
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The algorithm < a class = "link" href = "regex_search.html" title = "regex_search" > < code class = "computeroutput" > < span class = "identifier" > regex_search< / span > < / code > < / a > will search a range
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denoted by a pair of bidirectional-iterators for a given regular expression.
The algorithm uses various heuristics to reduce the search time by only checking
for a match if a match could conceivably start at that position. The algorithm
is defined as follows:
< / p >
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< pre class = "programlisting" > < span class = "keyword" > template< / span > < span class = "special" > < < / span > < span class = "keyword" > class< / span > < span class = "identifier" > BidirectionalIterator< / span > < span class = "special" > ,< / span >
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< span class = "keyword" > class< / span > < span class = "identifier" > Allocator< / span > < span class = "special" > ,< / span > < span class = "keyword" > class< / span > < span class = "identifier" > charT< / span > < span class = "special" > ,< / span > < span class = "keyword" > class< / span > < span class = "identifier" > traits< / span > < span class = "special" > > < / span >
< span class = "keyword" > bool< / span > < span class = "identifier" > regex_search< / span > < span class = "special" > (< / span > < span class = "identifier" > BidirectionalIterator< / span > < span class = "identifier" > first< / span > < span class = "special" > ,< / span > < span class = "identifier" > BidirectionalIterator< / span > < span class = "identifier" > last< / span > < span class = "special" > ,< / span >
< span class = "identifier" > match_results< / span > < span class = "special" > < < / span > < span class = "identifier" > BidirectionalIterator< / span > < span class = "special" > ,< / span > < span class = "identifier" > Allocator< / span > < span class = "special" > > & < / span > < span class = "identifier" > m< / span > < span class = "special" > ,< / span >
< span class = "keyword" > const< / span > < span class = "identifier" > basic_regex< / span > < span class = "special" > < < / span > < span class = "identifier" > charT< / span > < span class = "special" > ,< / span > < span class = "identifier" > traits< / span > < span class = "special" > > & < / span > < span class = "identifier" > e< / span > < span class = "special" > ,< / span >
< span class = "identifier" > match_flag_type< / span > < span class = "identifier" > flags< / span > < span class = "special" > =< / span > < span class = "identifier" > match_default< / span > < span class = "special" > );< / span >
< span class = "keyword" > template< / span > < span class = "special" > < < / span > < span class = "keyword" > class< / span > < span class = "identifier" > ST< / span > < span class = "special" > ,< / span > < span class = "keyword" > class< / span > < span class = "identifier" > SA< / span > < span class = "special" > ,< / span >
< span class = "keyword" > class< / span > < span class = "identifier" > Allocator< / span > < span class = "special" > ,< / span > < span class = "keyword" > class< / span > < span class = "identifier" > charT< / span > < span class = "special" > ,< / span > < span class = "keyword" > class< / span > < span class = "identifier" > traits< / span > < span class = "special" > > < / span >
< span class = "keyword" > bool< / span > < span class = "identifier" > regex_search< / span > < span class = "special" > (< / span > < span class = "keyword" > const< / span > < span class = "identifier" > basic_string< / span > < span class = "special" > < < / span > < span class = "identifier" > charT< / span > < span class = "special" > ,< / span > < span class = "identifier" > ST< / span > < span class = "special" > ,< / span > < span class = "identifier" > SA< / span > < span class = "special" > > & < / span > < span class = "identifier" > s< / span > < span class = "special" > ,< / span >
< span class = "identifier" > match_results< / span > < span class = "special" > < < / span >
< span class = "keyword" > typename< / span > < span class = "identifier" > basic_string< / span > < span class = "special" > < < / span > < span class = "identifier" > charT< / span > < span class = "special" > ,< / span > < span class = "identifier" > ST< / span > < span class = "special" > ,< / span > < span class = "identifier" > SA< / span > < span class = "special" > > ::< / span > < span class = "identifier" > const_iterator< / span > < span class = "special" > ,< / span >
< span class = "identifier" > Allocator< / span > < span class = "special" > > & < / span > < span class = "identifier" > m< / span > < span class = "special" > ,< / span >
< span class = "keyword" > const< / span > < span class = "identifier" > basic_regex< / span > < span class = "special" > < < / span > < span class = "identifier" > charT< / span > < span class = "special" > ,< / span > < span class = "identifier" > traits< / span > < span class = "special" > > & < / span > < span class = "identifier" > e< / span > < span class = "special" > ,< / span >
< span class = "identifier" > match_flag_type< / span > < span class = "identifier" > flags< / span > < span class = "special" > =< / span > < span class = "identifier" > match_default< / span > < span class = "special" > );< / span >
< span class = "keyword" > template< / span > < span class = "special" > < < / span > < span class = "keyword" > class< / span > < span class = "identifier" > charT< / span > < span class = "special" > ,< / span > < span class = "keyword" > class< / span > < span class = "identifier" > Allocator< / span > < span class = "special" > ,< / span > < span class = "keyword" > class< / span > < span class = "identifier" > traits< / span > < span class = "special" > > < / span >
< span class = "keyword" > bool< / span > < span class = "identifier" > regex_search< / span > < span class = "special" > (< / span > < span class = "keyword" > const< / span > < span class = "identifier" > charT< / span > < span class = "special" > *< / span > < span class = "identifier" > str< / span > < span class = "special" > ,< / span >
< span class = "identifier" > match_results< / span > < span class = "special" > < < / span > < span class = "keyword" > const< / span > < span class = "identifier" > charT< / span > < span class = "special" > *,< / span > < span class = "identifier" > Allocator< / span > < span class = "special" > > & < / span > < span class = "identifier" > m< / span > < span class = "special" > ,< / span >
< span class = "keyword" > const< / span > < span class = "identifier" > basic_regex< / span > < span class = "special" > < < / span > < span class = "identifier" > charT< / span > < span class = "special" > ,< / span > < span class = "identifier" > traits< / span > < span class = "special" > > & < / span > < span class = "identifier" > e< / span > < span class = "special" > ,< / span >
< span class = "identifier" > match_flag_type< / span > < span class = "identifier" > flags< / span > < span class = "special" > =< / span > < span class = "identifier" > match_default< / span > < span class = "special" > );< / span >
< span class = "keyword" > template< / span > < span class = "special" > < < / span > < span class = "keyword" > class< / span > < span class = "identifier" > BidirectionalIterator< / span > < span class = "special" > ,< / span > < span class = "keyword" > class< / span > < span class = "identifier" > charT< / span > < span class = "special" > ,< / span > < span class = "keyword" > class< / span > < span class = "identifier" > traits< / span > < span class = "special" > > < / span >
< span class = "keyword" > bool< / span > < span class = "identifier" > regex_search< / span > < span class = "special" > (< / span > < span class = "identifier" > BidirectionalIterator< / span > < span class = "identifier" > first< / span > < span class = "special" > ,< / span > < span class = "identifier" > BidirectionalIterator< / span > < span class = "identifier" > last< / span > < span class = "special" > ,< / span >
< span class = "keyword" > const< / span > < span class = "identifier" > basic_regex< / span > < span class = "special" > < < / span > < span class = "identifier" > charT< / span > < span class = "special" > ,< / span > < span class = "identifier" > traits< / span > < span class = "special" > > & < / span > < span class = "identifier" > e< / span > < span class = "special" > ,< / span >
< span class = "identifier" > match_flag_type< / span > < span class = "identifier" > flags< / span > < span class = "special" > =< / span > < span class = "identifier" > match_default< / span > < span class = "special" > );< / span >
< span class = "keyword" > template< / span > < span class = "special" > < < / span > < span class = "keyword" > class< / span > < span class = "identifier" > charT< / span > < span class = "special" > ,< / span > < span class = "keyword" > class< / span > < span class = "identifier" > traits< / span > < span class = "special" > > < / span >
< span class = "keyword" > bool< / span > < span class = "identifier" > regex_search< / span > < span class = "special" > (< / span > < span class = "keyword" > const< / span > < span class = "identifier" > charT< / span > < span class = "special" > *< / span > < span class = "identifier" > str< / span > < span class = "special" > ,< / span >
< span class = "keyword" > const< / span > < span class = "identifier" > basic_regex< / span > < span class = "special" > < < / span > < span class = "identifier" > charT< / span > < span class = "special" > ,< / span > < span class = "identifier" > traits< / span > < span class = "special" > > & < / span > < span class = "identifier" > e< / span > < span class = "special" > ,< / span >
< span class = "identifier" > match_flag_type< / span > < span class = "identifier" > flags< / span > < span class = "special" > =< / span > < span class = "identifier" > match_default< / span > < span class = "special" > );< / span >
< span class = "keyword" > template< / span > < span class = "special" > < < / span > < span class = "keyword" > class< / span > < span class = "identifier" > ST< / span > < span class = "special" > ,< / span > < span class = "keyword" > class< / span > < span class = "identifier" > SA< / span > < span class = "special" > ,< / span > < span class = "keyword" > class< / span > < span class = "identifier" > charT< / span > < span class = "special" > ,< / span > < span class = "keyword" > class< / span > < span class = "identifier" > traits< / span > < span class = "special" > > < / span >
< span class = "keyword" > bool< / span > < span class = "identifier" > regex_search< / span > < span class = "special" > (< / span > < span class = "keyword" > const< / span > < span class = "identifier" > basic_string< / span > < span class = "special" > < < / span > < span class = "identifier" > charT< / span > < span class = "special" > ,< / span > < span class = "identifier" > ST< / span > < span class = "special" > ,< / span > < span class = "identifier" > SA< / span > < span class = "special" > > & < / span > < span class = "identifier" > s< / span > < span class = "special" > ,< / span >
< span class = "keyword" > const< / span > < span class = "identifier" > basic_regex< / span > < span class = "special" > < < / span > < span class = "identifier" > charT< / span > < span class = "special" > ,< / span > < span class = "identifier" > traits< / span > < span class = "special" > > & < / span > < span class = "identifier" > e< / span > < span class = "special" > ,< / span >
< span class = "identifier" > match_flag_type< / span > < span class = "identifier" > flags< / span > < span class = "special" > =< / span > < span class = "identifier" > match_default< / span > < span class = "special" > );< / span >
< / pre >
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< a name = "boost_regex.ref.regex_search.description" > < / a > < h5 >
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< a name = "id1117191" > < / a >
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< a class = "link" href = "regex_search.html#boost_regex.ref.regex_search.description" > Description< / a >
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< / h5 >
< pre class = "programlisting" > < span class = "keyword" > template< / span > < span class = "special" > < < / span > < span class = "keyword" > class< / span > < span class = "identifier" > BidirectionalIterator< / span > < span class = "special" > ,< / span > < span class = "keyword" > class< / span > < span class = "identifier" > Allocator< / span > < span class = "special" > ,< / span > < span class = "keyword" > class< / span > < span class = "identifier" > charT< / span > < span class = "special" > ,< / span > < span class = "keyword" > class< / span > < span class = "identifier" > traits< / span > < span class = "special" > > < / span >
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< span class = "keyword" > bool< / span > < span class = "identifier" > regex_search< / span > < span class = "special" > (< / span > < span class = "identifier" > BidirectionalIterator< / span > < span class = "identifier" > first< / span > < span class = "special" > ,< / span > < span class = "identifier" > BidirectionalIterator< / span > < span class = "identifier" > last< / span > < span class = "special" > ,< / span >
< span class = "identifier" > match_results< / span > < span class = "special" > < < / span > < span class = "identifier" > BidirectionalIterator< / span > < span class = "special" > ,< / span > < span class = "identifier" > Allocator< / span > < span class = "special" > > & < / span > < span class = "identifier" > m< / span > < span class = "special" > ,< / span >
< span class = "keyword" > const< / span > < span class = "identifier" > basic_regex< / span > < span class = "special" > < < / span > < span class = "identifier" > charT< / span > < span class = "special" > ,< / span > < span class = "identifier" > traits< / span > < span class = "special" > > & < / span > < span class = "identifier" > e< / span > < span class = "special" > ,< / span >
< span class = "identifier" > match_flag_type< / span > < span class = "identifier" > flags< / span > < span class = "special" > =< / span > < span class = "identifier" > match_default< / span > < span class = "special" > );< / span >
< / pre >
< p >
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< span class = "bold" > < strong > Requires< / strong > < / span > : Type BidirectionalIterator meets
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the requirements of a Bidirectional Iterator (24.1.4).
< / p >
< p >
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< span class = "bold" > < strong > Effects< / strong > < / span > : Determines whether there is some
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sub-sequence within [first,last) that matches the regular expression < span class = "emphasis" > < em > e< / em > < / span > ,
parameter < span class = "emphasis" > < em > flags< / em > < / span > is used to control how the expression
is matched against the character sequence. Returns true if such a sequence
exists, false otherwise.
< / p >
< p >
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< span class = "bold" > < strong > Throws< / strong > < / span > : < code class = "computeroutput" > < span class = "identifier" > std< / span > < span class = "special" > ::< / span > < span class = "identifier" > runtime_error< / span > < / code >
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if the complexity of matching the expression against an N character string
begins to exceed O(N< sup > 2< / sup > ), or if the program runs out of stack space while matching
the expression (if Boost.Regex is configured in recursive mode), or if the
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matcher exhausts its permitted memory allocation (if Boost.Regex is configured
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in non-recursive mode).
< / p >
< p >
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< span class = "bold" > < strong > Postconditions< / strong > < / span > : If the function returns
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false, then the effect on parameter < span class = "emphasis" > < em > m< / em > < / span > is undefined,
otherwise the effects on parameter < span class = "emphasis" > < em > m< / em > < / span > are given in the
table:
< / p >
< div class = "informaltable" > < table class = "table" >
< colgroup >
< col >
< col >
< / colgroup >
< thead > < tr >
< th >
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< p >
Element
< / p >
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< / th >
< th >
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< p >
Value
< / p >
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< / th >
< / tr > < / thead >
< tbody >
< tr >
< td >
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< p >
< code class = "computeroutput" > < span class = "identifier" > m< / span > < span class = "special" > .< / span > < span class = "identifier" > size< / span > < span class = "special" > ()< / span > < / code >
< / p >
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< / td >
< td >
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< p >
< code class = "computeroutput" > < span class = "identifier" > e< / span > < span class = "special" > .< / span > < span class = "identifier" > mark_count< / span > < span class = "special" > ()< / span > < / code >
< / p >
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< / td >
< / tr >
< tr >
< td >
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< p >
< code class = "computeroutput" > < span class = "identifier" > m< / span > < span class = "special" > .< / span > < span class = "identifier" > empty< / span > < span class = "special" > ()< / span > < / code >
< / p >
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< / td >
< td >
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< p >
< code class = "computeroutput" > < span class = "keyword" > false< / span > < / code >
< / p >
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< / td >
< / tr >
< tr >
< td >
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< p >
< code class = "computeroutput" > < span class = "identifier" > m< / span > < span class = "special" > .< / span > < span class = "identifier" > prefix< / span > < span class = "special" > ().< / span > < span class = "identifier" > first< / span > < / code >
< / p >
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< / td >
< td >
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< p >
< code class = "computeroutput" > < span class = "identifier" > first< / span > < / code >
< / p >
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< / td >
< / tr >
< tr >
< td >
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< p >
< code class = "computeroutput" > < span class = "identifier" > m< / span > < span class = "special" > .< / span > < span class = "identifier" > prefix< / span > < span class = "special" > ().< / span > < span class = "identifier" > last< / span > < / code >
< / p >
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< / td >
< td >
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< p >
< code class = "computeroutput" > < span class = "identifier" > m< / span > < span class = "special" > [< / span > < span class = "number" > 0< / span > < span class = "special" > ].< / span > < span class = "identifier" > first< / span > < / code >
< / p >
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< / td >
< / tr >
< tr >
< td >
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< p >
< code class = "computeroutput" > < span class = "identifier" > m< / span > < span class = "special" > .< / span > < span class = "identifier" > prefix< / span > < span class = "special" > ().< / span > < span class = "identifier" > matched< / span > < / code >
< / p >
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< / td >
< td >
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< p >
< code class = "computeroutput" > < span class = "identifier" > m< / span > < span class = "special" > .< / span > < span class = "identifier" > prefix< / span > < span class = "special" > ().< / span > < span class = "identifier" > first< / span > < span class = "special" > !=< / span >
< span class = "identifier" > m< / span > < span class = "special" > .< / span > < span class = "identifier" > prefix< / span > < span class = "special" > ().< / span > < span class = "identifier" > second< / span > < / code >
< / p >
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< / td >
< / tr >
< tr >
< td >
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< p >
< code class = "computeroutput" > < span class = "identifier" > m< / span > < span class = "special" > .< / span > < span class = "identifier" > suffix< / span > < span class = "special" > ().< / span > < span class = "identifier" > first< / span > < / code >
< / p >
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< / td >
< td >
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< p >
< code class = "computeroutput" > < span class = "identifier" > m< / span > < span class = "special" > [< / span > < span class = "number" > 0< / span > < span class = "special" > ].< / span > < span class = "identifier" > second< / span > < / code >
< / p >
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< / td >
< / tr >
< tr >
< td >
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< p >
< code class = "computeroutput" > < span class = "identifier" > m< / span > < span class = "special" > .< / span > < span class = "identifier" > suffix< / span > < span class = "special" > ().< / span > < span class = "identifier" > last< / span > < / code >
< / p >
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< / td >
< td >
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< p >
< code class = "computeroutput" > < span class = "identifier" > last< / span > < / code >
< / p >
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< / td >
< / tr >
< tr >
< td >
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< p >
< code class = "computeroutput" > < span class = "identifier" > m< / span > < span class = "special" > .< / span > < span class = "identifier" > suffix< / span > < span class = "special" > ().< / span > < span class = "identifier" > matched< / span > < / code >
< / p >
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< / td >
< td >
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< p >
< code class = "computeroutput" > < span class = "identifier" > m< / span > < span class = "special" > .< / span > < span class = "identifier" > suffix< / span > < span class = "special" > ().< / span > < span class = "identifier" > first< / span > < span class = "special" > !=< / span >
< span class = "identifier" > m< / span > < span class = "special" > .< / span > < span class = "identifier" > suffix< / span > < span class = "special" > ().< / span > < span class = "identifier" > second< / span > < / code >
< / p >
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< / td >
< / tr >
< tr >
< td >
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< p >
< code class = "computeroutput" > < span class = "identifier" > m< / span > < span class = "special" > [< / span > < span class = "number" > 0< / span > < span class = "special" > ].< / span > < span class = "identifier" > first< / span > < / code >
< / p >
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< / td >
< td >
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< p >
The start of the sequence of characters that matched the regular
expression
< / p >
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< / td >
< / tr >
< tr >
< td >
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< p >
< code class = "computeroutput" > < span class = "identifier" > m< / span > < span class = "special" > [< / span > < span class = "number" > 0< / span > < span class = "special" > ].< / span > < span class = "identifier" > second< / span > < / code >
< / p >
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< / td >
< td >
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< p >
The end of the sequence of characters that matched the regular
expression
< / p >
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< / td >
< / tr >
< tr >
< td >
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< p >
< code class = "computeroutput" > < span class = "identifier" > m< / span > < span class = "special" > [< / span > < span class = "number" > 0< / span > < span class = "special" > ].< / span > < span class = "identifier" > matched< / span > < / code >
< / p >
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< / td >
< td >
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< p >
true if a full match was found, and false if it was a partial match
(found as a result of the match_partial flag being set).
< / p >
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< / td >
< / tr >
< tr >
< td >
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< p >
< code class = "computeroutput" > < span class = "identifier" > m< / span > < span class = "special" > [< / span > < span class = "identifier" > n< / span > < span class = "special" > ].< / span > < span class = "identifier" > first< / span > < / code >
< / p >
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< / td >
< td >
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< p >
For all integers < code class = "computeroutput" > < span class = "identifier" > n< / span > < span class = "special" > < < / span > < span class = "identifier" > m< / span > < span class = "special" > .< / span > < span class = "identifier" > size< / span > < span class = "special" > ()< / span > < / code > , the start of the sequence that
matched sub-expression < span class = "emphasis" > < em > n< / em > < / span > . Alternatively, if
sub-expression < span class = "emphasis" > < em > n< / em > < / span > did not participate in the
match, then last.
< / p >
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< / td >
< / tr >
< tr >
< td >
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< p >
< code class = "computeroutput" > < span class = "identifier" > m< / span > < span class = "special" > [< / span > < span class = "identifier" > n< / span > < span class = "special" > ].< / span > < span class = "identifier" > second< / span > < / code >
< / p >
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< / td >
< td >
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< p >
For all integers < code class = "computeroutput" > < span class = "identifier" > n< / span > < span class = "special" > < < / span > < span class = "identifier" > m< / span > < span class = "special" > .< / span > < span class = "identifier" > size< / span > < span class = "special" > ()< / span > < / code > , the end of the sequence that
matched sub-expression < span class = "emphasis" > < em > n< / em > < / span > . Alternatively, if
sub-expression < span class = "emphasis" > < em > n< / em > < / span > did not participate in the
match, then < code class = "computeroutput" > < span class = "identifier" > last< / span > < / code > .
< / p >
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< / td >
< / tr >
< tr >
< td >
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< p >
< code class = "computeroutput" > < span class = "identifier" > m< / span > < span class = "special" > [< / span > < span class = "identifier" > n< / span > < span class = "special" > ].< / span > < span class = "identifier" > matched< / span > < / code >
< / p >
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< / td >
< td >
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< p >
For all integers < code class = "computeroutput" > < span class = "identifier" > n< / span > < span class = "special" > < < / span > < span class = "identifier" > m< / span > < span class = "special" > .< / span > < span class = "identifier" > size< / span > < span class = "special" > ()< / span > < / code > , true if sub-expression < span class = "emphasis" > < em > n< / em > < / span >
participated in the match, false otherwise.
< / p >
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< / td >
< / tr >
< / tbody >
< / table > < / div >
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< pre class = "programlisting" > < span class = "keyword" > template< / span > < span class = "special" > < < / span > < span class = "keyword" > class< / span > < span class = "identifier" > charT< / span > < span class = "special" > ,< / span > < span class = "keyword" > class< / span > < span class = "identifier" > Allocator< / span > < span class = "special" > ,< / span > < span class = "keyword" > class< / span > < span class = "identifier" > traits< / span > < span class = "special" > > < / span >
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< span class = "keyword" > bool< / span > < span class = "identifier" > regex_search< / span > < span class = "special" > (< / span > < span class = "keyword" > const< / span > < span class = "identifier" > charT< / span > < span class = "special" > *< / span > < span class = "identifier" > str< / span > < span class = "special" > ,< / span > < span class = "identifier" > match_results< / span > < span class = "special" > < < / span > < span class = "keyword" > const< / span > < span class = "identifier" > charT< / span > < span class = "special" > *,< / span > < span class = "identifier" > Allocator< / span > < span class = "special" > > & < / span > < span class = "identifier" > m< / span > < span class = "special" > ,< / span >
< span class = "keyword" > const< / span > < span class = "identifier" > basic_regex< / span > < span class = "special" > < < / span > < span class = "identifier" > charT< / span > < span class = "special" > ,< / span > < span class = "identifier" > traits< / span > < span class = "special" > > & < / span > < span class = "identifier" > e< / span > < span class = "special" > ,< / span >
< span class = "identifier" > match_flag_type< / span > < span class = "identifier" > flags< / span > < span class = "special" > =< / span > < span class = "identifier" > match_default< / span > < span class = "special" > );< / span >
< / pre >
< p >
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< span class = "bold" > < strong > Effects< / strong > < / span > : Returns the result of < code class = "computeroutput" > < span class = "identifier" > regex_search< / span > < span class = "special" > (< / span > < span class = "identifier" > str< / span > < span class = "special" > ,< / span > < span class = "identifier" > str< / span >
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< span class = "special" > +< / span > < span class = "identifier" > char_traits< / span > < span class = "special" > < < / span > < span class = "identifier" > charT< / span > < span class = "special" > > ::< / span > < span class = "identifier" > length< / span > < span class = "special" > (< / span > < span class = "identifier" > str< / span > < span class = "special" > ),< / span >
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< span class = "identifier" > m< / span > < span class = "special" > ,< / span > < span class = "identifier" > e< / span > < span class = "special" > ,< / span > < span class = "identifier" > flags< / span > < span class = "special" > )< / span > < / code > .
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< / p >
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< pre class = "programlisting" > < span class = "keyword" > template< / span > < span class = "special" > < < / span > < span class = "keyword" > class< / span > < span class = "identifier" > ST< / span > < span class = "special" > ,< / span > < span class = "keyword" > class< / span > < span class = "identifier" > SA< / span > < span class = "special" > ,< / span > < span class = "keyword" > class< / span > < span class = "identifier" > Allocator< / span > < span class = "special" > ,< / span > < span class = "keyword" > class< / span > < span class = "identifier" > charT< / span > < span class = "special" > ,< / span >
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< span class = "keyword" > class< / span > < span class = "identifier" > traits< / span > < span class = "special" > > < / span >
< span class = "keyword" > bool< / span > < span class = "identifier" > regex_search< / span > < span class = "special" > (< / span > < span class = "keyword" > const< / span > < span class = "identifier" > basic_string< / span > < span class = "special" > < < / span > < span class = "identifier" > charT< / span > < span class = "special" > ,< / span > < span class = "identifier" > ST< / span > < span class = "special" > ,< / span > < span class = "identifier" > SA< / span > < span class = "special" > > & < / span > < span class = "identifier" > s< / span > < span class = "special" > ,< / span >
< span class = "identifier" > match_results< / span > < span class = "special" > < < / span > < span class = "keyword" > typename< / span > < span class = "identifier" > basic_string< / span > < span class = "special" > < < / span > < span class = "identifier" > charT< / span > < span class = "special" > ,< / span > < span class = "identifier" > ST< / span > < span class = "special" > ,< / span > < span class = "identifier" > SA< / span > < span class = "special" > > ::< / span > < span class = "identifier" > const_iterator< / span > < span class = "special" > ,< / span > < span class = "identifier" > Allocator< / span > < span class = "special" > > & < / span > < span class = "identifier" > m< / span > < span class = "special" > ,< / span >
< span class = "keyword" > const< / span > < span class = "identifier" > basic_regex< / span > < span class = "special" > < < / span > < span class = "identifier" > charT< / span > < span class = "special" > ,< / span > < span class = "identifier" > traits< / span > < span class = "special" > > & < / span > < span class = "identifier" > e< / span > < span class = "special" > ,< / span >
< span class = "identifier" > match_flag_type< / span > < span class = "identifier" > flags< / span > < span class = "special" > =< / span > < span class = "identifier" > match_default< / span > < span class = "special" > );< / span >
< / pre >
< p >
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< span class = "bold" > < strong > Effects< / strong > < / span > : Returns the result of < code class = "computeroutput" > < span class = "identifier" > regex_search< / span > < span class = "special" > (< / span > < span class = "identifier" > s< / span > < span class = "special" > .< / span > < span class = "identifier" > begin< / span > < span class = "special" > (),< / span > < span class = "identifier" > s< / span > < span class = "special" > .< / span > < span class = "identifier" > end< / span > < span class = "special" > (),< / span > < span class = "identifier" > m< / span > < span class = "special" > ,< / span > < span class = "identifier" > e< / span > < span class = "special" > ,< / span > < span class = "identifier" > flags< / span > < span class = "special" > )< / span > < / code > .
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< / p >
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< pre class = "programlisting" > < span class = "keyword" > template< / span > < span class = "special" > < < / span > < span class = "keyword" > class< / span > < span class = "identifier" > iterator< / span > < span class = "special" > ,< / span > < span class = "keyword" > class< / span > < span class = "identifier" > charT< / span > < span class = "special" > ,< / span > < span class = "keyword" > class< / span > < span class = "identifier" > traits< / span > < span class = "special" > > < / span >
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< span class = "keyword" > bool< / span > < span class = "identifier" > regex_search< / span > < span class = "special" > (< / span > < span class = "identifier" > iterator< / span > < span class = "identifier" > first< / span > < span class = "special" > ,< / span > < span class = "identifier" > iterator< / span > < span class = "identifier" > last< / span > < span class = "special" > ,< / span >
< span class = "keyword" > const< / span > < span class = "identifier" > basic_regex< / span > < span class = "special" > < < / span > < span class = "identifier" > charT< / span > < span class = "special" > ,< / span > < span class = "identifier" > traits< / span > < span class = "special" > > & < / span > < span class = "identifier" > e< / span > < span class = "special" > ,< / span >
< span class = "identifier" > match_flag_type< / span > < span class = "identifier" > flags< / span > < span class = "special" > =< / span > < span class = "identifier" > match_default< / span > < span class = "special" > );< / span >
< / pre >
< p >
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< span class = "bold" > < strong > Effects< / strong > < / span > : Behaves "as if" by constructing
an instance of < code class = "computeroutput" > < span class = "identifier" > match_results< / span > < span class = "special" > < < / span > < span class = "identifier" > BidirectionalIterator< / span > < span class = "special" > > < / span > < span class = "identifier" > what< / span > < / code > ,
and then returning the result of < code class = "computeroutput" > < span class = "identifier" > regex_search< / span > < span class = "special" > (< / span > < span class = "identifier" > first< / span > < span class = "special" > ,< / span > < span class = "identifier" > last< / span > < span class = "special" > ,< / span > < span class = "identifier" > what< / span > < span class = "special" > ,< / span > < span class = "identifier" > e< / span > < span class = "special" > ,< / span >
< span class = "identifier" > flags< / span > < span class = "special" > )< / span > < / code > .
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< / p >
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< pre class = "programlisting" > < span class = "keyword" > template< / span > < span class = "special" > < < / span > < span class = "keyword" > class< / span > < span class = "identifier" > charT< / span > < span class = "special" > ,< / span > < span class = "keyword" > class< / span > < span class = "identifier" > traits< / span > < span class = "special" > > < / span >
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< span class = "keyword" > bool< / span > < span class = "identifier" > regex_search< / span > < span class = "special" > (< / span > < span class = "keyword" > const< / span > < span class = "identifier" > charT< / span > < span class = "special" > *< / span > < span class = "identifier" > str< / span >
< span class = "keyword" > const< / span > < span class = "identifier" > basic_regex< / span > < span class = "special" > < < / span > < span class = "identifier" > charT< / span > < span class = "special" > ,< / span > < span class = "identifier" > traits< / span > < span class = "special" > > & < / span > < span class = "identifier" > e< / span > < span class = "special" > ,< / span >
< span class = "identifier" > match_flag_type< / span > < span class = "identifier" > flags< / span > < span class = "special" > =< / span > < span class = "identifier" > match_default< / span > < span class = "special" > );< / span >
< / pre >
< p >
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< span class = "bold" > < strong > Effects< / strong > < / span > : Returns the result of < code class = "computeroutput" > < span class = "identifier" > regex_search< / span > < span class = "special" > (< / span > < span class = "identifier" > str< / span > < span class = "special" > ,< / span > < span class = "identifier" > str< / span >
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< span class = "special" > +< / span > < span class = "identifier" > char_traits< / span > < span class = "special" > < < / span > < span class = "identifier" > charT< / span > < span class = "special" > > ::< / span > < span class = "identifier" > length< / span > < span class = "special" > (< / span > < span class = "identifier" > str< / span > < span class = "special" > ),< / span >
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< span class = "identifier" > e< / span > < span class = "special" > ,< / span > < span class = "identifier" > flags< / span > < span class = "special" > )< / span > < / code > .
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< / p >
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< pre class = "programlisting" > < span class = "keyword" > template< / span > < span class = "special" > < < / span > < span class = "keyword" > class< / span > < span class = "identifier" > ST< / span > < span class = "special" > ,< / span > < span class = "keyword" > class< / span > < span class = "identifier" > SA< / span > < span class = "special" > ,< / span > < span class = "keyword" > class< / span > < span class = "identifier" > charT< / span > < span class = "special" > ,< / span > < span class = "keyword" > class< / span > < span class = "identifier" > traits< / span > < span class = "special" > > < / span >
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< span class = "keyword" > bool< / span > < span class = "identifier" > regex_search< / span > < span class = "special" > (< / span > < span class = "keyword" > const< / span > < span class = "identifier" > basic_string< / span > < span class = "special" > < < / span > < span class = "identifier" > charT< / span > < span class = "special" > ,< / span > < span class = "identifier" > ST< / span > < span class = "special" > ,< / span > < span class = "identifier" > SA< / span > < span class = "special" > > & < / span > < span class = "identifier" > s< / span > < span class = "special" > ,< / span >
< span class = "keyword" > const< / span > < span class = "identifier" > basic_regex< / span > < span class = "special" > < < / span > < span class = "identifier" > charT< / span > < span class = "special" > ,< / span > < span class = "identifier" > traits< / span > < span class = "special" > > & < / span > < span class = "identifier" > e< / span > < span class = "special" > ,< / span >
< span class = "identifier" > match_flag_type< / span > < span class = "identifier" > flags< / span > < span class = "special" > =< / span > < span class = "identifier" > match_default< / span > < span class = "special" > );< / span >
< / pre >
< p >
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< span class = "bold" > < strong > Effects< / strong > < / span > : Returns the result of < code class = "computeroutput" > < span class = "identifier" > regex_search< / span > < span class = "special" > (< / span > < span class = "identifier" > s< / span > < span class = "special" > .< / span > < span class = "identifier" > begin< / span > < span class = "special" > (),< / span > < span class = "identifier" > s< / span > < span class = "special" > .< / span > < span class = "identifier" > end< / span > < span class = "special" > (),< / span > < span class = "identifier" > e< / span > < span class = "special" > ,< / span > < span class = "identifier" > flags< / span > < span class = "special" > )< / span > < / code > .
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< / p >
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< a name = "boost_regex.ref.regex_search.examples" > < / a > < h5 >
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< a name = "id1120735" > < / a >
2008-12-23 11:46:00 +00:00
< a class = "link" href = "regex_search.html#boost_regex.ref.regex_search.examples" > Examples< / a >
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< / h5 >
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< p >
The following example, takes the contents of a file in the form of a string,
and searches for all the C++ class declarations in the file. The code will
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work regardless of the way that < code class = "computeroutput" > < span class = "identifier" > std< / span > < span class = "special" > ::< / span > < span class = "identifier" > string< / span > < / code >
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is implemented, for example it could easily be modified to work with the
SGI rope class, which uses a non-contiguous storage strategy.
< / p >
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< pre class = "programlisting" > < span class = "preprocessor" > #include< / span > < span class = "special" > < < / span > < span class = "identifier" > string< / span > < span class = "special" > > < / span >
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< span class = "preprocessor" > #include< / span > < span class = "special" > < < / span > < span class = "identifier" > map< / span > < span class = "special" > > < / span >
< span class = "preprocessor" > #include< / span > < span class = "special" > < < / span > < span class = "identifier" > boost< / span > < span class = "special" > /< / span > < span class = "identifier" > regex< / span > < span class = "special" > .< / span > < span class = "identifier" > hpp< / span > < span class = "special" > > < / span >
< span class = "comment" > // purpose:
< / span > < span class = "comment" > // takes the contents of a file in the form of a string
< / span > < span class = "comment" > // and searches for all the C++ class definitions, storing
< / span > < span class = "comment" > // their locations in a map of strings/int's
< / span > < span class = "keyword" > typedef< / span > < span class = "identifier" > std< / span > < span class = "special" > ::< / span > < span class = "identifier" > map< / span > < span class = "special" > < < / span > < span class = "identifier" > std< / span > < span class = "special" > ::< / span > < span class = "identifier" > string< / span > < span class = "special" > ,< / span > < span class = "keyword" > int< / span > < span class = "special" > ,< / span > < span class = "identifier" > std< / span > < span class = "special" > ::< / span > < span class = "identifier" > less< / span > < span class = "special" > < < / span > < span class = "identifier" > std< / span > < span class = "special" > ::< / span > < span class = "identifier" > string< / span > < span class = "special" > > < / span > < span class = "special" > > < / span > < span class = "identifier" > map_type< / span > < span class = "special" > ;< / span >
< span class = "identifier" > boost< / span > < span class = "special" > ::< / span > < span class = "identifier" > regex< / span > < span class = "identifier" > expression< / span > < span class = "special" > (< / span >
< span class = "string" > "^(template[[:space:]]*< [^;:{]+> [[:space:]]*)?"< / span >
< span class = "string" > "(class|struct)[[:space:]]*"< / span >
< span class = "string" > "(\\< \\w+\\> ([[:blank:]]*\\([^)]*\\))?"< / span >
< span class = "string" > "[[:space:]]*)*(\\< \\w*\\> )[[:space:]]*"< / span >
< span class = "string" > "(< [^;:{]+> [[:space:]]*)?(\\{|:[^;\\{()]*\\{)"< / span > < span class = "special" > );< / span >
< span class = "keyword" > void< / span > < span class = "identifier" > IndexClasses< / span > < span class = "special" > (< / span > < span class = "identifier" > map_type< / span > < span class = "special" > & < / span > < span class = "identifier" > m< / span > < span class = "special" > ,< / span > < span class = "keyword" > const< / span > < span class = "identifier" > std< / span > < span class = "special" > ::< / span > < span class = "identifier" > string< / span > < span class = "special" > & < / span > < span class = "identifier" > file< / span > < span class = "special" > )< / span >
< span class = "special" > {< / span >
< span class = "identifier" > std< / span > < span class = "special" > ::< / span > < span class = "identifier" > string< / span > < span class = "special" > ::< / span > < span class = "identifier" > const_iterator< / span > < span class = "identifier" > start< / span > < span class = "special" > ,< / span > < span class = "identifier" > end< / span > < span class = "special" > ;< / span >
< span class = "identifier" > start< / span > < span class = "special" > =< / span > < span class = "identifier" > file< / span > < span class = "special" > .< / span > < span class = "identifier" > begin< / span > < span class = "special" > ();< / span >
< span class = "identifier" > end< / span > < span class = "special" > =< / span > < span class = "identifier" > file< / span > < span class = "special" > .< / span > < span class = "identifier" > end< / span > < span class = "special" > ();< / span >
< span class = "identifier" > boost< / span > < span class = "special" > ::< / span > < span class = "identifier" > match_results< / span > < span class = "special" > < < / span > < span class = "identifier" > std< / span > < span class = "special" > ::< / span > < span class = "identifier" > string< / span > < span class = "special" > ::< / span > < span class = "identifier" > const_iterator< / span > < span class = "special" > > < / span > < span class = "identifier" > what< / span > < span class = "special" > ;< / span >
< span class = "identifier" > boost< / span > < span class = "special" > ::< / span > < span class = "identifier" > match_flag_type< / span > < span class = "identifier" > flags< / span > < span class = "special" > =< / span > < span class = "identifier" > boost< / span > < span class = "special" > ::< / span > < span class = "identifier" > match_default< / span > < span class = "special" > ;< / span >
< span class = "keyword" > while< / span > < span class = "special" > (< / span > < span class = "identifier" > regex_search< / span > < span class = "special" > (< / span > < span class = "identifier" > start< / span > < span class = "special" > ,< / span > < span class = "identifier" > end< / span > < span class = "special" > ,< / span > < span class = "identifier" > what< / span > < span class = "special" > ,< / span > < span class = "identifier" > expression< / span > < span class = "special" > ,< / span > < span class = "identifier" > flags< / span > < span class = "special" > ))< / span >
< span class = "special" > {< / span >
< span class = "comment" > // what[0] contains the whole string
< / span > < span class = "comment" > // what[5] contains the class name.
< / span > < span class = "comment" > // what[6] contains the template specialisation if any.
< / span > < span class = "comment" > // add class name and position to map:
< / span > < span class = "identifier" > m< / span > < span class = "special" > [< / span > < span class = "identifier" > std< / span > < span class = "special" > ::< / span > < span class = "identifier" > string< / span > < span class = "special" > (< / span > < span class = "identifier" > what< / span > < span class = "special" > [< / span > < span class = "number" > 5< / span > < span class = "special" > ].< / span > < span class = "identifier" > first< / span > < span class = "special" > ,< / span > < span class = "identifier" > what< / span > < span class = "special" > [< / span > < span class = "number" > 5< / span > < span class = "special" > ].< / span > < span class = "identifier" > second< / span > < span class = "special" > )< / span >
< span class = "special" > +< / span > < span class = "identifier" > std< / span > < span class = "special" > ::< / span > < span class = "identifier" > string< / span > < span class = "special" > (< / span > < span class = "identifier" > what< / span > < span class = "special" > [< / span > < span class = "number" > 6< / span > < span class = "special" > ].< / span > < span class = "identifier" > first< / span > < span class = "special" > ,< / span > < span class = "identifier" > what< / span > < span class = "special" > [< / span > < span class = "number" > 6< / span > < span class = "special" > ].< / span > < span class = "identifier" > second< / span > < span class = "special" > )]< / span >
< span class = "special" > =< / span > < span class = "identifier" > what< / span > < span class = "special" > [< / span > < span class = "number" > 5< / span > < span class = "special" > ].< / span > < span class = "identifier" > first< / span > < span class = "special" > -< / span > < span class = "identifier" > file< / span > < span class = "special" > .< / span > < span class = "identifier" > begin< / span > < span class = "special" > ();< / span >
< span class = "comment" > // update search position:
< / span > < span class = "identifier" > start< / span > < span class = "special" > =< / span > < span class = "identifier" > what< / span > < span class = "special" > [< / span > < span class = "number" > 0< / span > < span class = "special" > ].< / span > < span class = "identifier" > second< / span > < span class = "special" > ;< / span >
< span class = "comment" > // update flags:
< / span > < span class = "identifier" > flags< / span > < span class = "special" > |=< / span > < span class = "identifier" > boost< / span > < span class = "special" > ::< / span > < span class = "identifier" > match_prev_avail< / span > < span class = "special" > ;< / span >
< span class = "identifier" > flags< / span > < span class = "special" > |=< / span > < span class = "identifier" > boost< / span > < span class = "special" > ::< / span > < span class = "identifier" > match_not_bob< / span > < span class = "special" > ;< / span >
< span class = "special" > }< / span >
< span class = "special" > }< / span >
< / pre >
< / div >
< table xmlns:rev = "http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width = "100%" > < tr >
< td align = "left" > < / td >
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< td align = "right" > < div class = "copyright-footer" > Copyright © 1998 -2007 John Maddock< p >
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Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at < a href = "http://www.boost.org/LICENSE_1_0.txt" target = "_top" > http://www.boost.org/LICENSE_1_0.txt< / a > )
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< / p >
< / div > < / td >
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< / tr > < / table >
< hr >
< div class = "spirit-nav" >
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< a accesskey = "p" href = "regex_match.html" > < img src = "../../../../../../doc/src/images/prev.png" alt = "Prev" > < / a > < a accesskey = "u" href = "../ref.html" > < img src = "../../../../../../doc/src/images/up.png" alt = "Up" > < / a > < a accesskey = "h" href = "../../index.html" > < img src = "../../../../../../doc/src/images/home.png" alt = "Home" > < / a > < a accesskey = "n" href = "regex_replace.html" > < img src = "../../../../../../doc/src/images/next.png" alt = "Next" > < / a >
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< / div >
< / body >
< / html >
