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[SVN r81819]
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John Maddock
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@ -3,7 +3,7 @@
<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
<title>POSIX Extended Regular Expression Syntax</title>
<link rel="stylesheet" href="../../../../../../doc/src/boostbook.css" type="text/css">
<meta name="generator" content="DocBook XSL Stylesheets V1.76.1">
<meta name="generator" content="DocBook XSL Stylesheets V1.77.1">
<link rel="home" href="../../index.html" title="Boost.Regex">
<link rel="up" href="../syntax.html" title="Regular Expression Syntax">
<link rel="prev" href="perl_syntax.html" title="Perl Regular Expression Syntax">
@ -29,7 +29,7 @@
</h3></div></div></div>
<h4>
<a name="boost_regex.syntax.basic_extended.h0"></a>
<span><a name="boost_regex.syntax.basic_extended.synopsis"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended.synopsis">Synopsis</a>
<span class="phrase"><a name="boost_regex.syntax.basic_extended.synopsis"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended.synopsis">Synopsis</a>
</h4>
<p>
The POSIX-Extended regular expression syntax is supported by the POSIX C
@ -45,7 +45,7 @@
</pre>
<a name="boost_regex.posix_extended_syntax"></a><h4>
<a name="boost_regex.syntax.basic_extended.h1"></a>
<span><a name="boost_regex.syntax.basic_extended.posix_extended_syntax"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended.posix_extended_syntax">POSIX Extended
<span class="phrase"><a name="boost_regex.syntax.basic_extended.posix_extended_syntax"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended.posix_extended_syntax">POSIX Extended
Syntax</a>
</h4>
<p>
@ -55,13 +55,13 @@
<pre class="programlisting">.[{}()\*+?|^$</pre>
<h5>
<a name="boost_regex.syntax.basic_extended.h2"></a>
<span><a name="boost_regex.syntax.basic_extended.wildcard_"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended.wildcard_">Wildcard:</a>
<span class="phrase"><a name="boost_regex.syntax.basic_extended.wildcard_"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended.wildcard_">Wildcard:</a>
</h5>
<p>
The single character '.' when used outside of a character set will match
any single character except:
</p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
The NULL character when the flag <code class="computeroutput"><span class="identifier">match_no_dot_null</span></code>
is passed to the matching algorithms.
@ -73,7 +73,7 @@
</ul></div>
<h5>
<a name="boost_regex.syntax.basic_extended.h3"></a>
<span><a name="boost_regex.syntax.basic_extended.anchors_"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended.anchors_">Anchors:</a>
<span class="phrase"><a name="boost_regex.syntax.basic_extended.anchors_"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended.anchors_">Anchors:</a>
</h5>
<p>
A '^' character shall match the start of a line when used as the first character
@ -85,7 +85,7 @@
</p>
<h5>
<a name="boost_regex.syntax.basic_extended.h4"></a>
<span><a name="boost_regex.syntax.basic_extended.marked_sub_expressions_"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended.marked_sub_expressions_">Marked
<span class="phrase"><a name="boost_regex.syntax.basic_extended.marked_sub_expressions_"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended.marked_sub_expressions_">Marked
sub-expressions:</a>
</h5>
<p>
@ -97,7 +97,7 @@
</p>
<h5>
<a name="boost_regex.syntax.basic_extended.h5"></a>
<span><a name="boost_regex.syntax.basic_extended.repeats_"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended.repeats_">Repeats:</a>
<span class="phrase"><a name="boost_regex.syntax.basic_extended.repeats_"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended.repeats_">Repeats:</a>
</h5>
<p>
Any atom (a single character, a marked sub-expression, or a character class)
@ -183,7 +183,7 @@ cab
</p>
<h5>
<a name="boost_regex.syntax.basic_extended.h6"></a>
<span><a name="boost_regex.syntax.basic_extended.back_references_"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended.back_references_">Back
<span class="phrase"><a name="boost_regex.syntax.basic_extended.back_references_"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended.back_references_">Back
references:</a>
</h5>
<p>
@ -214,7 +214,7 @@ cab
</table></div>
<h5>
<a name="boost_regex.syntax.basic_extended.h7"></a>
<span><a name="boost_regex.syntax.basic_extended.alternation"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended.alternation">Alternation</a>
<span class="phrase"><a name="boost_regex.syntax.basic_extended.alternation"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended.alternation">Alternation</a>
</h5>
<p>
The <code class="computeroutput"><span class="special">|</span></code> operator will match either
@ -227,7 +227,7 @@ cab
</p>
<h5>
<a name="boost_regex.syntax.basic_extended.h8"></a>
<span><a name="boost_regex.syntax.basic_extended.character_sets_"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended.character_sets_">Character
<span class="phrase"><a name="boost_regex.syntax.basic_extended.character_sets_"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended.character_sets_">Character
sets:</a>
</h5>
<p>
@ -240,7 +240,7 @@ cab
</p>
<h6>
<a name="boost_regex.syntax.basic_extended.h9"></a>
<span><a name="boost_regex.syntax.basic_extended.single_characters_"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended.single_characters_">Single characters:</a>
<span class="phrase"><a name="boost_regex.syntax.basic_extended.single_characters_"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended.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',
@ -248,7 +248,7 @@ cab
</p>
<h6>
<a name="boost_regex.syntax.basic_extended.h10"></a>
<span><a name="boost_regex.syntax.basic_extended.character_ranges_"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended.character_ranges_">Character
<span class="phrase"><a name="boost_regex.syntax.basic_extended.character_ranges_"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended.character_ranges_">Character
ranges:</a>
</h6>
<p>
@ -264,7 +264,7 @@ cab
</p>
<h6>
<a name="boost_regex.syntax.basic_extended.h11"></a>
<span><a name="boost_regex.syntax.basic_extended.negation_"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended.negation_">Negation:</a>
<span class="phrase"><a name="boost_regex.syntax.basic_extended.negation_"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended.negation_">Negation:</a>
</h6>
<p>
If the bracket-expression begins with the ^ character, then it matches the
@ -273,7 +273,7 @@ cab
</p>
<h6>
<a name="boost_regex.syntax.basic_extended.h12"></a>
<span><a name="boost_regex.syntax.basic_extended.character_classes_"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended.character_classes_">Character
<span class="phrase"><a name="boost_regex.syntax.basic_extended.character_classes_"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended.character_classes_">Character
classes:</a>
</h6>
<p>
@ -283,7 +283,7 @@ cab
</p>
<h6>
<a name="boost_regex.syntax.basic_extended.h13"></a>
<span><a name="boost_regex.syntax.basic_extended.collating_elements_"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended.collating_elements_">Collating
<span class="phrase"><a name="boost_regex.syntax.basic_extended.collating_elements_"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended.collating_elements_">Collating
Elements:</a>
</h6>
<p>
@ -311,7 +311,7 @@ cab
</p>
<h6>
<a name="boost_regex.syntax.basic_extended.h14"></a>
<span><a name="boost_regex.syntax.basic_extended.equivalence_classes_"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended.equivalence_classes_">Equivalence
<span class="phrase"><a name="boost_regex.syntax.basic_extended.equivalence_classes_"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended.equivalence_classes_">Equivalence
classes:</a>
</h6>
<p>
@ -328,7 +328,7 @@ cab
</p>
<h6>
<a name="boost_regex.syntax.basic_extended.h15"></a>
<span><a name="boost_regex.syntax.basic_extended.combinations_"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended.combinations_">Combinations:</a>
<span class="phrase"><a name="boost_regex.syntax.basic_extended.combinations_"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended.combinations_">Combinations:</a>
</h6>
<p>
All of the above can be combined in one character set declaration, for example:
@ -336,13 +336,13 @@ cab
</p>
<h5>
<a name="boost_regex.syntax.basic_extended.h16"></a>
<span><a name="boost_regex.syntax.basic_extended.escapes"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended.escapes">Escapes</a>
<span class="phrase"><a name="boost_regex.syntax.basic_extended.escapes"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended.escapes">Escapes</a>
</h5>
<p>
The POSIX standard defines no escape sequences for POSIX-Extended regular
expressions, except that:
</p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
Any special character preceded by an escape shall match itself.
</li>
@ -362,7 +362,7 @@ cab
</p>
<h6>
<a name="boost_regex.syntax.basic_extended.h17"></a>
<span><a name="boost_regex.syntax.basic_extended.escapes_matching_a_specific_character"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended.escapes_matching_a_specific_character">Escapes
<span class="phrase"><a name="boost_regex.syntax.basic_extended.escapes_matching_a_specific_character"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended.escapes_matching_a_specific_character">Escapes
matching a specific character</a>
</h6>
<p>
@ -551,7 +551,7 @@ cab
</table></div>
<h6>
<a name="boost_regex.syntax.basic_extended.h18"></a>
<span><a name="boost_regex.syntax.basic_extended._quot_single_character_quot__character_classes_"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended._quot_single_character_quot__character_classes_">"Single
<span class="phrase"><a name="boost_regex.syntax.basic_extended._quot_single_character_quot__character_classes_"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended._quot_single_character_quot__character_classes_">"Single
character" character classes:</a>
</h6>
<p>
@ -705,7 +705,7 @@ cab
</table></div>
<h6>
<a name="boost_regex.syntax.basic_extended.h19"></a>
<span><a name="boost_regex.syntax.basic_extended.character_properties"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended.character_properties">Character
<span class="phrase"><a name="boost_regex.syntax.basic_extended.character_properties"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended.character_properties">Character
Properties</a>
</h6>
<p>
@ -812,7 +812,7 @@ cab
</p>
<h6>
<a name="boost_regex.syntax.basic_extended.h20"></a>
<span><a name="boost_regex.syntax.basic_extended.word_boundaries"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended.word_boundaries">Word
<span class="phrase"><a name="boost_regex.syntax.basic_extended.word_boundaries"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended.word_boundaries">Word
Boundaries</a>
</h6>
<p>
@ -888,7 +888,7 @@ cab
</table></div>
<h6>
<a name="boost_regex.syntax.basic_extended.h21"></a>
<span><a name="boost_regex.syntax.basic_extended.buffer_boundaries"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended.buffer_boundaries">Buffer
<span class="phrase"><a name="boost_regex.syntax.basic_extended.buffer_boundaries"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended.buffer_boundaries">Buffer
boundaries</a>
</h6>
<p>
@ -979,7 +979,7 @@ cab
</table></div>
<h6>
<a name="boost_regex.syntax.basic_extended.h22"></a>
<span><a name="boost_regex.syntax.basic_extended.continuation_escape"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended.continuation_escape">Continuation
<span class="phrase"><a name="boost_regex.syntax.basic_extended.continuation_escape"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended.continuation_escape">Continuation
Escape</a>
</h6>
<p>
@ -991,7 +991,7 @@ cab
</p>
<h6>
<a name="boost_regex.syntax.basic_extended.h23"></a>
<span><a name="boost_regex.syntax.basic_extended.quoting_escape"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended.quoting_escape">Quoting
<span class="phrase"><a name="boost_regex.syntax.basic_extended.quoting_escape"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended.quoting_escape">Quoting
escape</a>
</h6>
<p>
@ -1005,7 +1005,7 @@ cab
</pre>
<h6>
<a name="boost_regex.syntax.basic_extended.h24"></a>
<span><a name="boost_regex.syntax.basic_extended.unicode_escapes"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended.unicode_escapes">Unicode
<span class="phrase"><a name="boost_regex.syntax.basic_extended.unicode_escapes"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended.unicode_escapes">Unicode
escapes</a>
</h6>
<div class="informaltable"><table class="table">
@ -1056,7 +1056,7 @@ cab
</table></div>
<h6>
<a name="boost_regex.syntax.basic_extended.h25"></a>
<span><a name="boost_regex.syntax.basic_extended.any_other_escape"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended.any_other_escape">Any
<span class="phrase"><a name="boost_regex.syntax.basic_extended.any_other_escape"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended.any_other_escape">Any
other escape</a>
</h6>
<p>
@ -1065,7 +1065,7 @@ cab
</p>
<h5>
<a name="boost_regex.syntax.basic_extended.h26"></a>
<span><a name="boost_regex.syntax.basic_extended.operator_precedence"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended.operator_precedence">Operator
<span class="phrase"><a name="boost_regex.syntax.basic_extended.operator_precedence"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended.operator_precedence">Operator
precedence</a>
</h5>
<p>
@ -1102,7 +1102,7 @@ cab
</ol></div>
<h5>
<a name="boost_regex.syntax.basic_extended.h27"></a>
<span><a name="boost_regex.syntax.basic_extended.what_gets_matched"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended.what_gets_matched">What
<span class="phrase"><a name="boost_regex.syntax.basic_extended.what_gets_matched"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended.what_gets_matched">What
Gets Matched</a>
</h5>
<p>
@ -1112,11 +1112,11 @@ cab
</p>
<h4>
<a name="boost_regex.syntax.basic_extended.h28"></a>
<span><a name="boost_regex.syntax.basic_extended.variations"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended.variations">Variations</a>
<span class="phrase"><a name="boost_regex.syntax.basic_extended.variations"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended.variations">Variations</a>
</h4>
<h5>
<a name="boost_regex.syntax.basic_extended.h29"></a>
<span><a name="boost_regex.syntax.basic_extended.egrep"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended.egrep">Egrep</a>
<span class="phrase"><a name="boost_regex.syntax.basic_extended.egrep"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended.egrep">Egrep</a>
</h5>
<p>
When an expression is compiled with the <a class="link" href="../ref/syntax_option_type.html" title="syntax_option_type">flag
@ -1137,7 +1137,7 @@ cab
</p>
<h5>
<a name="boost_regex.syntax.basic_extended.h30"></a>
<span><a name="boost_regex.syntax.basic_extended.awk"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended.awk">awk</a>
<span class="phrase"><a name="boost_regex.syntax.basic_extended.awk"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended.awk">awk</a>
</h5>
<p>
In addition to the <a class="link" href="basic_extended.html#boost_regex.posix_extended_syntax">POSIX-Extended
@ -1151,7 +1151,7 @@ cab
</p>
<h4>
<a name="boost_regex.syntax.basic_extended.h31"></a>
<span><a name="boost_regex.syntax.basic_extended.options"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended.options">Options</a>
<span class="phrase"><a name="boost_regex.syntax.basic_extended.options"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended.options">Options</a>
</h4>
<p>
There are a <a class="link" href="../ref/syntax_option_type/syntax_option_type_extended.html" title="Options for POSIX Extended Regular Expressions">variety
@ -1164,7 +1164,7 @@ cab
</p>
<h4>
<a name="boost_regex.syntax.basic_extended.h32"></a>
<span><a name="boost_regex.syntax.basic_extended.references"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended.references">References</a>
<span class="phrase"><a name="boost_regex.syntax.basic_extended.references"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended.references">References</a>
</h4>
<p>
<a href="http://www.opengroup.org/onlinepubs/000095399/basedefs/xbd_chap09.html" target="_top">IEEE