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Fix gcc warnings from ICU wrappers.

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Add optional support for marked sub-expression location information.
Add support for ${n} in format replacement text.
Fixes #2556.
Fixes #2269.
Fixes #2514.

[SVN r50370]
This commit is contained in:
John Maddock
2008-12-23 11:46:00 +00:00
parent c997a1fcc6
commit b4152cd74d
94 changed files with 1344 additions and 1068 deletions
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@ -3,8 +3,8 @@
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Perl Regular Expression Syntax</title>
<link rel="stylesheet" href="../../../../../../doc/html/boostbook.css" type="text/css">
<meta name="generator" content="DocBook XSL Stylesheets Vsnapshot_2006-12-17_0120">
<link rel="start" href="../../index.html" title="Boost.Regex">
<meta name="generator" content="DocBook XSL Stylesheets Vsnapshot_8125">
<link rel="home" href="../../index.html" title="Boost.Regex">
<link rel="up" href="../syntax.html" title="Regular Expression Syntax">
<link rel="prev" href="../syntax.html" title="Regular Expression Syntax">
<link rel="next" href="basic_extended.html" title="POSIX Extended Regular Expression Syntax">
@ -24,18 +24,18 @@
</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h3 class="title">
<a name="boost_regex.syntax.perl_syntax"></a><a href="perl_syntax.html" title="Perl Regular Expression Syntax"> Perl Regular Expression
<a name="boost_regex.syntax.perl_syntax"></a><a class="link" href="perl_syntax.html" title="Perl Regular Expression Syntax"> Perl Regular Expression
Syntax</a>
</h3></div></div></div>
<a name="boost_regex.syntax.perl_syntax.synopsis"></a><h4>
<a name="id507588"></a>
<a href="perl_syntax.html#boost_regex.syntax.perl_syntax.synopsis">Synopsis</a>
<a name="id535061"></a>
<a class="link" href="perl_syntax.html#boost_regex.syntax.perl_syntax.synopsis">Synopsis</a>
</h4>
<p>
The Perl regular expression syntax is based on that used by the programming
language Perl . Perl regular expressions are the default behavior in Boost.Regex
or you can pass the flag <code class="computeroutput"><span class="identifier">perl</span></code>
to the <a href="../ref/basic_regex.html" title="basic_regex"><code class="computeroutput"><span class="identifier">basic_regex</span></code></a>
to the <a class="link" href="../ref/basic_regex.html" title="basic_regex"><code class="computeroutput"><span class="identifier">basic_regex</span></code></a>
constructor, for example:
</p>
<pre class="programlisting"><span class="comment">// e1 is a case sensitive Perl regular expression:
@ -45,8 +45,8 @@
</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">regex</span> <span class="identifier">e2</span><span class="special">(</span><span class="identifier">my_expression</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">perl</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">icase</span><span class="special">);</span>
</pre>
<a name="boost_regex.syntax.perl_syntax.perl_regular_expression_syntax"></a><h4>
<a name="id507810"></a>
<a href="perl_syntax.html#boost_regex.syntax.perl_syntax.perl_regular_expression_syntax">Perl
<a name="id535282"></a>
<a class="link" href="perl_syntax.html#boost_regex.syntax.perl_syntax.perl_regular_expression_syntax">Perl
Regular Expression Syntax</a>
</h4>
<p>
@ -55,8 +55,8 @@
</p>
<pre class="programlisting">.[{()\*+?|^$</pre>
<a name="boost_regex.syntax.perl_syntax.wildcard"></a><h5>
<a name="id507848"></a>
<a href="perl_syntax.html#boost_regex.syntax.perl_syntax.wildcard">Wildcard</a>
<a name="id535320"></a>
<a class="link" href="perl_syntax.html#boost_regex.syntax.perl_syntax.wildcard">Wildcard</a>
</h5>
<p>
The single character '.' when used outside of a character set will match
@ -64,19 +64,19 @@
</p>
<div class="itemizedlist"><ul type="disc">
<li>
The NULL character when the <a href="../ref/match_flag_type.html" title="match_flag_type">flag
The NULL character when the <a class="link" href="../ref/match_flag_type.html" title="match_flag_type">flag
<code class="computeroutput"><span class="identifier">match_not_dot_null</span></code></a>
is passed to the matching algorithms.
</li>
<li>
The newline character when the <a href="../ref/match_flag_type.html" title="match_flag_type">flag
The newline character when the <a class="link" href="../ref/match_flag_type.html" title="match_flag_type">flag
<code class="computeroutput"><span class="identifier">match_not_dot_newline</span></code></a>
is passed to the matching algorithms.
</li>
</ul></div>
<a name="boost_regex.syntax.perl_syntax.anchors"></a><h5>
<a name="id507929"></a>
<a href="perl_syntax.html#boost_regex.syntax.perl_syntax.anchors">Anchors</a>
<a name="id535401"></a>
<a class="link" href="perl_syntax.html#boost_regex.syntax.perl_syntax.anchors">Anchors</a>
</h5>
<p>
A '^' character shall match the start of a line.
@ -85,8 +85,8 @@
A '$' character shall match the end of a line.
</p>
<a name="boost_regex.syntax.perl_syntax.marked_sub_expressions"></a><h5>
<a name="id507962"></a>
<a href="perl_syntax.html#boost_regex.syntax.perl_syntax.marked_sub_expressions">Marked
<a name="id535435"></a>
<a class="link" href="perl_syntax.html#boost_regex.syntax.perl_syntax.marked_sub_expressions">Marked
sub-expressions</a>
</h5>
<p>
@ -97,8 +97,8 @@
to by a back-reference.
</p>
<a name="boost_regex.syntax.perl_syntax.non_marking_grouping"></a><h5>
<a name="id508018"></a>
<a href="perl_syntax.html#boost_regex.syntax.perl_syntax.non_marking_grouping">Non-marking
<a name="id535490"></a>
<a class="link" href="perl_syntax.html#boost_regex.syntax.perl_syntax.non_marking_grouping">Non-marking
grouping</a>
</h5>
<p>
@ -111,8 +111,8 @@
out any separate sub-expressions.
</p>
<a name="boost_regex.syntax.perl_syntax.repeats"></a><h5>
<a name="id508106"></a>
<a href="perl_syntax.html#boost_regex.syntax.perl_syntax.repeats">Repeats</a>
<a name="id535579"></a>
<a class="link" href="perl_syntax.html#boost_regex.syntax.perl_syntax.repeats">Repeats</a>
</h5>
<p>
Any atom (a single character, a marked sub-expression, or a character class)
@ -197,8 +197,8 @@
operator to be applied to.
</p>
<a name="boost_regex.syntax.perl_syntax.non_greedy_repeats"></a><h5>
<a name="id508580"></a>
<a href="perl_syntax.html#boost_regex.syntax.perl_syntax.non_greedy_repeats">Non greedy
<a name="id536052"></a>
<a class="link" href="perl_syntax.html#boost_regex.syntax.perl_syntax.non_greedy_repeats">Non greedy
repeats</a>
</h5>
<p>
@ -228,8 +228,8 @@
input as possible.
</p>
<a name="boost_regex.syntax.perl_syntax.back_references"></a><h5>
<a name="id508725"></a>
<a href="perl_syntax.html#boost_regex.syntax.perl_syntax.back_references">Back references</a>
<a name="id536197"></a>
<a class="link" href="perl_syntax.html#boost_regex.syntax.perl_syntax.back_references">Back references</a>
</h5>
<p>
An escape character followed by a digit <span class="emphasis"><em>n</em></span>, where <span class="emphasis"><em>n</em></span>
@ -248,8 +248,8 @@
<pre class="programlisting"><span class="identifier">aaabba</span>
</pre>
<a name="boost_regex.syntax.perl_syntax.alternation"></a><h5>
<a name="id508808"></a>
<a href="perl_syntax.html#boost_regex.syntax.perl_syntax.alternation">Alternation</a>
<a name="id536280"></a>
<a class="link" href="perl_syntax.html#boost_regex.syntax.perl_syntax.alternation">Alternation</a>
</h5>
<p>
The <code class="computeroutput"><span class="special">|</span></code> operator will match either
@ -277,8 +277,8 @@
<code class="computeroutput"><span class="special">(?:</span><span class="identifier">abc</span><span class="special">)??</span></code> has exactly the same effect.
</p>
<a name="boost_regex.syntax.perl_syntax.character_sets"></a><h5>
<a name="id508996"></a>
<a href="perl_syntax.html#boost_regex.syntax.perl_syntax.character_sets">Character sets</a>
<a name="id536469"></a>
<a class="link" href="perl_syntax.html#boost_regex.syntax.perl_syntax.character_sets">Character sets</a>
</h5>
<p>
A character set is a bracket-expression starting with <code class="computeroutput"><span class="special">[</span></code>
@ -290,16 +290,16 @@
A bracket expression may contain any combination of the following:
</p>
<a name="boost_regex.syntax.perl_syntax.single_characters"></a><h6>
<a name="id509055"></a>
<a href="perl_syntax.html#boost_regex.syntax.perl_syntax.single_characters">Single characters</a>
<a name="id536527"></a>
<a class="link" href="perl_syntax.html#boost_regex.syntax.perl_syntax.single_characters">Single characters</a>
</h6>
<p>
For example <code class="computeroutput"><span class="special">[</span><span class="identifier">abc</span><span class="special">]</span></code>, will match any of the characters 'a', 'b',
or 'c'.
</p>
<a name="boost_regex.syntax.perl_syntax.character_ranges"></a><h6>
<a name="id509105"></a>
<a href="perl_syntax.html#boost_regex.syntax.perl_syntax.character_ranges">Character
<a name="id536578"></a>
<a class="link" href="perl_syntax.html#boost_regex.syntax.perl_syntax.character_ranges">Character
ranges</a>
</h6>
<p>
@ -307,12 +307,12 @@
will match any single character in the range 'a' to 'c'. By default, for
Perl regular expressions, a character x is within the range y to z, if the
code point of the character lies within the codepoints of the endpoints of
the range. Alternatively, if you set the <a href="../ref/syntax_option_type/syntax_option_type_perl.html" title="Options for Perl Regular Expressions"><code class="computeroutput"><span class="identifier">collate</span></code> flag</a> when constructing the
the range. Alternatively, if you set the <a class="link" href="../ref/syntax_option_type/syntax_option_type_perl.html" title="Options for Perl Regular Expressions"><code class="computeroutput"><span class="identifier">collate</span></code> flag</a> when constructing the
regular expression, then ranges are locale sensitive.
</p>
<a name="boost_regex.syntax.perl_syntax.negation"></a><h6>
<a name="id509186"></a>
<a href="perl_syntax.html#boost_regex.syntax.perl_syntax.negation">Negation</a>
<a name="id536658"></a>
<a class="link" href="perl_syntax.html#boost_regex.syntax.perl_syntax.negation">Negation</a>
</h6>
<p>
If the bracket-expression begins with the ^ character, then it matches the
@ -320,18 +320,18 @@
range <code class="computeroutput"><span class="identifier">a</span><span class="special">-</span><span class="identifier">c</span></code>.
</p>
<a name="boost_regex.syntax.perl_syntax.character_classes"></a><h6>
<a name="id509268"></a>
<a href="perl_syntax.html#boost_regex.syntax.perl_syntax.character_classes">Character
<a name="id536740"></a>
<a class="link" href="perl_syntax.html#boost_regex.syntax.perl_syntax.character_classes">Character
classes</a>
</h6>
<p>
An expression of the form <code class="computeroutput"><span class="special">[[:</span><span class="identifier">name</span><span class="special">:]]</span></code>
matches the named character class "name", for example <code class="computeroutput"><span class="special">[[:</span><span class="identifier">lower</span><span class="special">:]]</span></code> matches any lower case character. See
<a href="character_classes.html" title="Character Class Names">character class names</a>.
<a class="link" href="character_classes.html" title="Character Class Names">character class names</a>.
</p>
<a name="boost_regex.syntax.perl_syntax.collating_elements"></a><h6>
<a name="id509351"></a>
<a href="perl_syntax.html#boost_regex.syntax.perl_syntax.collating_elements">Collating
<a name="id536823"></a>
<a class="link" href="perl_syntax.html#boost_regex.syntax.perl_syntax.collating_elements">Collating
Elements</a>
</h6>
<p>
@ -345,7 +345,7 @@
a single collating element in the current locale.
</p>
<p>
As an extension, a collating element may also be specified via it's <a href="collating_names.html" title="Collating Names">symbolic name</a>, for example:
As an extension, a collating element may also be specified via it's <a class="link" href="collating_names.html" title="Collating Names">symbolic name</a>, for example:
</p>
<pre class="programlisting"><span class="special">[[.</span><span class="identifier">NUL</span><span class="special">.]]</span>
</pre>
@ -354,15 +354,15 @@
character.
</p>
<a name="boost_regex.syntax.perl_syntax.equivalence_classes"></a><h6>
<a name="id509500"></a>
<a href="perl_syntax.html#boost_regex.syntax.perl_syntax.equivalence_classes">Equivalence
<a name="id536972"></a>
<a class="link" href="perl_syntax.html#boost_regex.syntax.perl_syntax.equivalence_classes">Equivalence
classes</a>
</h6>
<p>
An expression of the form <code class="computeroutput"><span class="special">[[=</span><span class="identifier">col</span><span class="special">=]]</span></code>,
matches any character or collating element whose primary sort key is the
same as that for collating element <span class="emphasis"><em>col</em></span>, as with collating
elements the name <span class="emphasis"><em>col</em></span> may be a <a href="collating_names.html" title="Collating Names">symbolic
elements the name <span class="emphasis"><em>col</em></span> may be a <a class="link" href="collating_names.html" title="Collating Names">symbolic
name</a>. A primary sort key is one that ignores case, accentation, or
locale-specific tailorings; so for example <code class="computeroutput"><span class="special">[[=</span><span class="identifier">a</span><span class="special">=]]</span></code> matches
any of the characters: a, <20>, <20>, <20>, <20>, <20>, <20>, A, <20>, <20>, <20>, <20>, <20> and <20>. Unfortunately implementation
@ -371,8 +371,8 @@
or even all locales on one platform.
</p>
<a name="boost_regex.syntax.perl_syntax.escaped_characters"></a><h6>
<a name="id509603"></a>
<a href="perl_syntax.html#boost_regex.syntax.perl_syntax.escaped_characters">Escaped
<a name="id537075"></a>
<a class="link" href="perl_syntax.html#boost_regex.syntax.perl_syntax.escaped_characters">Escaped
Characters</a>
</h6>
<p>
@ -383,16 +383,16 @@
is <span class="emphasis"><em>not</em></span> a "word" character.
</p>
<a name="boost_regex.syntax.perl_syntax.combinations"></a><h6>
<a name="id509709"></a>
<a href="perl_syntax.html#boost_regex.syntax.perl_syntax.combinations">Combinations</a>
<a name="id537181"></a>
<a class="link" href="perl_syntax.html#boost_regex.syntax.perl_syntax.combinations">Combinations</a>
</h6>
<p>
All of the above can be combined in one character set declaration, for example:
<code class="computeroutput"><span class="special">[[:</span><span class="identifier">digit</span><span class="special">:]</span><span class="identifier">a</span><span class="special">-</span><span class="identifier">c</span><span class="special">[.</span><span class="identifier">NUL</span><span class="special">.]]</span></code>.
</p>
<a name="boost_regex.syntax.perl_syntax.escapes"></a><h5>
<a name="id509787"></a>
<a href="perl_syntax.html#boost_regex.syntax.perl_syntax.escapes">Escapes</a>
<a name="id537259"></a>
<a class="link" href="perl_syntax.html#boost_regex.syntax.perl_syntax.escapes">Escapes</a>
</h5>
<p>
Any special character preceded by an escape shall match itself.
@ -576,7 +576,7 @@
</td>
<td>
<p>
Matches the single character which has the <a href="collating_names.html" title="Collating Names">symbolic
Matches the single character which has the <a class="link" href="collating_names.html" title="Collating Names">symbolic
name</a> <span class="emphasis"><em>name</em></span>. For example <code class="computeroutput"><span class="special">\</span><span class="identifier">N</span><span class="special">{</span><span class="identifier">newline</span><span class="special">}</span></code> matches the single character \n.
</p>
</td>
@ -584,8 +584,8 @@
</tbody>
</table></div>
<a name="boost_regex.syntax.perl_syntax._quot_single_character_quot__character_classes_"></a><h6>
<a name="id510500"></a>
<a href="perl_syntax.html#boost_regex.syntax.perl_syntax._quot_single_character_quot__character_classes_">"Single
<a name="id537972"></a>
<a class="link" href="perl_syntax.html#boost_regex.syntax.perl_syntax._quot_single_character_quot__character_classes_">"Single
character" character classes:</a>
</h6>
<p>
@ -738,13 +738,13 @@
</tbody>
</table></div>
<a name="boost_regex.syntax.perl_syntax.character_properties"></a><h6>
<a name="id511132"></a>
<a href="perl_syntax.html#boost_regex.syntax.perl_syntax.character_properties">Character
<a name="id538604"></a>
<a class="link" href="perl_syntax.html#boost_regex.syntax.perl_syntax.character_properties">Character
Properties</a>
</h6>
<p>
The character property names in the following table are all equivalent to
the <a href="character_classes.html" title="Character Class Names">names used in character
the <a class="link" href="character_classes.html" title="Character Class Names">names used in character
classes</a>.
</p>
<div class="informaltable"><table class="table">
@ -846,8 +846,8 @@
matches any "digit" character, as does <code class="computeroutput"><span class="special">\</span><span class="identifier">p</span><span class="special">{</span><span class="identifier">digit</span><span class="special">}</span></code>.
</p>
<a name="boost_regex.syntax.perl_syntax.word_boundaries"></a><h6>
<a name="id511541"></a>
<a href="perl_syntax.html#boost_regex.syntax.perl_syntax.word_boundaries">Word Boundaries</a>
<a name="id539013"></a>
<a class="link" href="perl_syntax.html#boost_regex.syntax.perl_syntax.word_boundaries">Word Boundaries</a>
</h6>
<p>
The following escape sequences match the boundaries of words:
@ -868,8 +868,8 @@
Matches only when not at a word boundary.
</p>
<a name="boost_regex.syntax.perl_syntax.buffer_boundaries"></a><h6>
<a name="id511643"></a>
<a href="perl_syntax.html#boost_regex.syntax.perl_syntax.buffer_boundaries">Buffer boundaries</a>
<a name="id539115"></a>
<a class="link" href="perl_syntax.html#boost_regex.syntax.perl_syntax.buffer_boundaries">Buffer boundaries</a>
</h6>
<p>
The following match only at buffer boundaries: a "buffer" in this
@ -893,8 +893,8 @@
to the regular expression <code class="computeroutput"><span class="special">\</span><span class="identifier">n</span><span class="special">*\</span><span class="identifier">z</span></code>
</p>
<a name="boost_regex.syntax.perl_syntax.continuation_escape"></a><h6>
<a name="id511726"></a>
<a href="perl_syntax.html#boost_regex.syntax.perl_syntax.continuation_escape">Continuation
<a name="id539198"></a>
<a class="link" href="perl_syntax.html#boost_regex.syntax.perl_syntax.continuation_escape">Continuation
Escape</a>
</h6>
<p>
@ -905,8 +905,8 @@
match to start where the last one ended.
</p>
<a name="boost_regex.syntax.perl_syntax.quoting_escape"></a><h6>
<a name="id511776"></a>
<a href="perl_syntax.html#boost_regex.syntax.perl_syntax.quoting_escape">Quoting escape</a>
<a name="id539248"></a>
<a class="link" href="perl_syntax.html#boost_regex.syntax.perl_syntax.quoting_escape">Quoting escape</a>
</h6>
<p>
The escape sequence <code class="computeroutput"><span class="special">\</span><span class="identifier">Q</span></code>
@ -918,8 +918,8 @@
<span class="special">\*+</span><span class="identifier">aaa</span>
</pre>
<a name="boost_regex.syntax.perl_syntax.unicode_escapes"></a><h6>
<a name="id511879"></a>
<a href="perl_syntax.html#boost_regex.syntax.perl_syntax.unicode_escapes">Unicode escapes</a>
<a name="id539354"></a>
<a class="link" href="perl_syntax.html#boost_regex.syntax.perl_syntax.unicode_escapes">Unicode escapes</a>
</h6>
<p>
<code class="computeroutput"><span class="special">\</span><span class="identifier">C</span></code>
@ -929,8 +929,8 @@
combining characters.
</p>
<a name="boost_regex.syntax.perl_syntax.any_other_escape"></a><h6>
<a name="id511943"></a>
<a href="perl_syntax.html#boost_regex.syntax.perl_syntax.any_other_escape">Any other
<a name="id539418"></a>
<a class="link" href="perl_syntax.html#boost_regex.syntax.perl_syntax.any_other_escape">Any other
escape</a>
</h6>
<p>
@ -938,8 +938,8 @@
\@ matches a literal '@'.
</p>
<a name="boost_regex.syntax.perl_syntax.perl_extended_patterns"></a><h5>
<a name="id511972"></a>
<a href="perl_syntax.html#boost_regex.syntax.perl_syntax.perl_extended_patterns">Perl
<a name="id539447"></a>
<a class="link" href="perl_syntax.html#boost_regex.syntax.perl_syntax.perl_extended_patterns">Perl
Extended Patterns</a>
</h5>
<p>
@ -947,8 +947,8 @@
<code class="computeroutput"><span class="special">(?</span></code>.
</p>
<a name="boost_regex.syntax.perl_syntax.comments"></a><h6>
<a name="id512014"></a>
<a href="perl_syntax.html#boost_regex.syntax.perl_syntax.comments">Comments</a>
<a name="id539489"></a>
<a class="link" href="perl_syntax.html#boost_regex.syntax.perl_syntax.comments">Comments</a>
</h6>
<p>
<code class="computeroutput"><span class="special">(?</span># <span class="special">...</span>
@ -956,8 +956,8 @@
are ignored.
</p>
<a name="boost_regex.syntax.perl_syntax.modifiers"></a><h6>
<a name="id512066"></a>
<a href="perl_syntax.html#boost_regex.syntax.perl_syntax.modifiers">Modifiers</a>
<a name="id539542"></a>
<a class="link" href="perl_syntax.html#boost_regex.syntax.perl_syntax.modifiers">Modifiers</a>
</h6>
<p>
<code class="computeroutput"><span class="special">(?</span><span class="identifier">imsx</span><span class="special">-</span><span class="identifier">imsx</span> <span class="special">...</span> <span class="special">)</span></code> alters
@ -971,8 +971,8 @@
applies the specified modifiers to pattern only.
</p>
<a name="boost_regex.syntax.perl_syntax.non_marking_groups"></a><h6>
<a name="id512193"></a>
<a href="perl_syntax.html#boost_regex.syntax.perl_syntax.non_marking_groups">Non-marking
<a name="id539669"></a>
<a class="link" href="perl_syntax.html#boost_regex.syntax.perl_syntax.non_marking_groups">Non-marking
groups</a>
</h6>
<p>
@ -980,8 +980,8 @@
an additional sub-expression.
</p>
<a name="boost_regex.syntax.perl_syntax.lookahead"></a><h6>
<a name="id512244"></a>
<a href="perl_syntax.html#boost_regex.syntax.perl_syntax.lookahead">Lookahead</a>
<a name="id539720"></a>
<a class="link" href="perl_syntax.html#boost_regex.syntax.perl_syntax.lookahead">Lookahead</a>
</h6>
<p>
<code class="computeroutput"><span class="special">(?=</span><span class="identifier">pattern</span><span class="special">)</span></code> consumes zero characters, only if pattern
@ -1003,8 +1003,8 @@
could be used to validate the password.
</p>
<a name="boost_regex.syntax.perl_syntax.lookbehind"></a><h6>
<a name="id512386"></a>
<a href="perl_syntax.html#boost_regex.syntax.perl_syntax.lookbehind">Lookbehind</a>
<a name="id539861"></a>
<a class="link" href="perl_syntax.html#boost_regex.syntax.perl_syntax.lookbehind">Lookbehind</a>
</h6>
<p>
<code class="computeroutput"><span class="special">(?&lt;=</span><span class="identifier">pattern</span><span class="special">)</span></code> consumes zero characters, only if pattern
@ -1017,8 +1017,8 @@
(pattern must be of fixed length).
</p>
<a name="boost_regex.syntax.perl_syntax.independent_sub_expressions"></a><h6>
<a name="id512464"></a>
<a href="perl_syntax.html#boost_regex.syntax.perl_syntax.independent_sub_expressions">Independent
<a name="id539939"></a>
<a class="link" href="perl_syntax.html#boost_regex.syntax.perl_syntax.independent_sub_expressions">Independent
sub-expressions</a>
</h6>
<p>
@ -1030,8 +1030,8 @@
no match is found at all.
</p>
<a name="boost_regex.syntax.perl_syntax.conditional_expressions"></a><h6>
<a name="id512528"></a>
<a href="perl_syntax.html#boost_regex.syntax.perl_syntax.conditional_expressions">Conditional
<a name="id540003"></a>
<a class="link" href="perl_syntax.html#boost_regex.syntax.perl_syntax.conditional_expressions">Conditional
Expressions</a>
</h6>
<p>
@ -1050,8 +1050,8 @@
sub-expression has been matched).
</p>
<a name="boost_regex.syntax.perl_syntax.operator_precedence"></a><h5>
<a name="id512696"></a>
<a href="perl_syntax.html#boost_regex.syntax.perl_syntax.operator_precedence">Operator
<a name="id540172"></a>
<a class="link" href="perl_syntax.html#boost_regex.syntax.perl_syntax.operator_precedence">Operator
precedence</a>
</h5>
<p>
@ -1086,8 +1086,8 @@
</li>
</ol></div>
<a name="boost_regex.syntax.perl_syntax.what_gets_matched"></a><h4>
<a name="id512875"></a>
<a href="perl_syntax.html#boost_regex.syntax.perl_syntax.what_gets_matched">What gets
<a name="id540350"></a>
<a class="link" href="perl_syntax.html#boost_regex.syntax.perl_syntax.what_gets_matched">What gets
matched</a>
</h4>
<p>
@ -1099,7 +1099,7 @@
Alternatively:
</p>
<p>
The best match found is the <a href="leftmost_longest_rule.html" title="The Leftmost Longest Rule">leftmost
The best match found is the <a class="link" href="leftmost_longest_rule.html" title="The Leftmost Longest Rule">leftmost
match</a>, with individual elements matched as follows;
</p>
<div class="informaltable"><table class="table">
@ -1271,20 +1271,20 @@
</tbody>
</table></div>
<a name="boost_regex.syntax.perl_syntax.variations"></a><h4>
<a name="id513789"></a>
<a href="perl_syntax.html#boost_regex.syntax.perl_syntax.variations">Variations</a>
<a name="id541265"></a>
<a class="link" href="perl_syntax.html#boost_regex.syntax.perl_syntax.variations">Variations</a>
</h4>
<p>
The <a href="../ref/syntax_option_type/syntax_option_type_perl.html" title="Options for Perl Regular Expressions">options
The <a class="link" href="../ref/syntax_option_type/syntax_option_type_perl.html" title="Options for Perl Regular Expressions">options
<code class="computeroutput"><span class="identifier">normal</span></code>, <code class="computeroutput"><span class="identifier">ECMAScript</span></code>,
<code class="computeroutput"><span class="identifier">JavaScript</span></code> and <code class="computeroutput"><span class="identifier">JScript</span></code></a> are all synonyms for <code class="computeroutput"><span class="identifier">perl</span></code>.
</p>
<a name="boost_regex.syntax.perl_syntax.options"></a><h4>
<a name="id513884"></a>
<a href="perl_syntax.html#boost_regex.syntax.perl_syntax.options">Options</a>
<a name="id541360"></a>
<a class="link" href="perl_syntax.html#boost_regex.syntax.perl_syntax.options">Options</a>
</h4>
<p>
There are a <a href="../ref/syntax_option_type/syntax_option_type_perl.html" title="Options for Perl Regular Expressions">variety
There are a <a class="link" href="../ref/syntax_option_type/syntax_option_type_perl.html" title="Options for Perl Regular Expressions">variety
of flags</a> that may be combined with the <code class="computeroutput"><span class="identifier">perl</span></code>
option when constructing the regular expression, in particular note that
the <code class="computeroutput"><span class="identifier">newline_alt</span></code> option alters
@ -1293,20 +1293,20 @@
sensitivity are to be applied.
</p>
<a name="boost_regex.syntax.perl_syntax.pattern_modifiers"></a><h4>
<a name="id513985"></a>
<a href="perl_syntax.html#boost_regex.syntax.perl_syntax.pattern_modifiers">Pattern
<a name="id541461"></a>
<a class="link" href="perl_syntax.html#boost_regex.syntax.perl_syntax.pattern_modifiers">Pattern
Modifiers</a>
</h4>
<p>
The perl <code class="computeroutput"><span class="identifier">smix</span></code> modifiers can
either be applied using a <code class="computeroutput"><span class="special">(?</span><span class="identifier">smix</span><span class="special">-</span><span class="identifier">smix</span><span class="special">)</span></code> prefix to the regular expression, or with
one of the <a href="../ref/syntax_option_type/syntax_option_type_perl.html" title="Options for Perl Regular Expressions">regex-compile
one of the <a class="link" href="../ref/syntax_option_type/syntax_option_type_perl.html" title="Options for Perl Regular Expressions">regex-compile
time flags <code class="computeroutput"><span class="identifier">no_mod_m</span></code>, <code class="computeroutput"><span class="identifier">mod_x</span></code>, <code class="computeroutput"><span class="identifier">mod_s</span></code>,
and <code class="computeroutput"><span class="identifier">no_mod_s</span></code></a>.
</p>
<a name="boost_regex.syntax.perl_syntax.references"></a><h4>
<a name="id514112"></a>
<a href="perl_syntax.html#boost_regex.syntax.perl_syntax.references">References</a>
<a name="id541588"></a>
<a class="link" href="perl_syntax.html#boost_regex.syntax.perl_syntax.references">References</a>
</h4>
<p>
<a href="http://perldoc.perl.org/perlre.html" target="_top">Perl 5.8</a>.