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Empty expressions, and empty alternatives are now

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allowed when using the Perl regular expression syntax.  This change has
been added for Perl compatibility, when the new [syntax_option_type]
['no_empty_expressions] is set then the old behaviour is preserved and
empty expressions are prohibited.  This is issue
[@https://svn.boost.org/trac/boost/ticket/1081 #1081].

Fixes #1081.

[SVN r50374]
This commit is contained in:
John Maddock
2008-12-23 19:06:04 +00:00
parent b4152cd74d
commit e4b31ea37f
25 changed files with 147 additions and 81 deletions
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2
include/boost/regex/v4/regbase.hpp
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@ -85,6 +85,7 @@ public:
collate = 1 << 21, // use locale specific collation
nosubs = 1 << 22, // don't mark sub-expressions
save_subexpression_location = 1 << 23, // save subexpression locations
no_empty_expressions = 1 << 24, // no empty expressions allowed
optimize = 0, // not really supported
@ -143,6 +144,7 @@ namespace regex_constants{
mod_s = ::boost::regbase::mod_s,
no_mod_s = ::boost::regbase::no_mod_s,
save_subexpression_location = ::boost::regbase::save_subexpression_location,
no_empty_expressions = ::boost::regbase::no_empty_expressions,
basic = ::boost::regbase::basic,
extended = ::boost::regbase::extended,