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<title>Perl Regular Expression Syntax</title>
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<div class="section boost_regex_syntax_perl_syntax">
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<div class="section boost_regex_syntax_perl_syntax">
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<div class="titlepage"><div><div><h3 class="title">
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<a name="boost_regex.syntax.perl_syntax"></a><a class="link" href="perl_syntax.html" title="Perl Regular Expression Syntax">Perl Regular Expression
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Syntax</a>
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</h5>
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<p>
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A character set is a bracket-expression starting with <code class="literal">[</code>
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and ending with <code class="literal">]</code>, it defines a set of characters, and
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and ending with <code class="literal"></code>], it defines a set of characters, and
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matches any single character that is a member of that set.
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</p>
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<p>
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<tr>
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<td>
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<p>
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<code class="literal">\n</code>
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<code class="literal"><br> </code>
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</p>
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</td>
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<td>
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<p>
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<code class="literal">\n</code>
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<code class="literal"><br> </code>
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</p>
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</td>
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</tr>
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The following escape sequences match the boundaries of words:
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</p>
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<p>
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<code class="literal">\<</code> Matches the start of a word.
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<code class="literal"><</code> Matches the start of a word.
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</p>
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<p>
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<code class="literal">\></code> Matches the end of a word.
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<code class="literal">></code> Matches the end of a word.
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</p>
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<p>
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<code class="literal">\b</code> Matches a word boundary (the start or end of a word).
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\' Matches at the end of a buffer only.
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</p>
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<p>
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\A Matches at the start of a buffer only (the same as =\`=).
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\A Matches at the start of a buffer only (the same as <code class="literal">\`</code>).
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</p>
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<p>
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\z Matches at the end of a buffer only (the same as <code class="literal">\\'</code>).
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\z Matches at the end of a buffer only (the same as <code class="literal">\'</code>).
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</p>
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<p>
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\Z Matches a zero-width assertion consisting of an optional sequence of newlines
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<p>
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The escape sequence <code class="literal">\Q</code> begins a "quoted sequence":
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all the subsequent characters are treated as literals, until either the end
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of the regular expression or \E is found. For example the expression: <code class="literal">\Q\*+\Ea+</code>
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of the regular expression or \E is found. For example the expression: <code class="literal">\Q*+\Ea+</code>
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would match either of:
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</p>
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<pre class="programlisting"><span class="special">\*+</span><span class="identifier">a</span>
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<span class="emphasis"><em>no-pattern</em></span>.
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</li>
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<li class="listitem">
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=(?(<span class="emphasis"><em>N</em></span>)yes-pattern|no-pattern)= Executes <span class="emphasis"><em>yes-pattern</em></span>
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if subexpression <span class="emphasis"><em>N</em></span> has been matched, otherwise executes
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<span class="emphasis"><em>no-pattern</em></span>.
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</li>
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<li class="listitem">
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=(?(<<span class="emphasis"><em>name</em></span>>)yes-pattern|no-pattern)= Executes
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<span class="emphasis"><em>yes-pattern</em></span> if named subexpression <span class="emphasis"><em>name</em></span>
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<code class="literal">(?(<span class="emphasis"><em>N</em></span>)yes-pattern|no-pattern)</code>
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Executes <span class="emphasis"><em>yes-pattern</em></span> if subexpression <span class="emphasis"><em>N</em></span>
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has been matched, otherwise executes <span class="emphasis"><em>no-pattern</em></span>.
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</li>
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<li class="listitem">
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=(?('<span class="emphasis"><em>name</em></span>')yes-pattern|no-pattern)= Executes <span class="emphasis"><em>yes-pattern</em></span>
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if named subexpression <span class="emphasis"><em>name</em></span> has been matched, otherwise
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executes <span class="emphasis"><em>no-pattern</em></span>.
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<code class="literal">(?(<<span class="emphasis"><em>name</em></span>>)yes-pattern|no-pattern)</code>
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Executes <span class="emphasis"><em>yes-pattern</em></span> if named subexpression <span class="emphasis"><em>name</em></span>
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has been matched, otherwise executes <span class="emphasis"><em>no-pattern</em></span>.
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</li>
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<li class="listitem">
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<code class="literal">(?('<span class="emphasis"><em>name</em></span>')yes-pattern|no-pattern)</code>
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Executes <span class="emphasis"><em>yes-pattern</em></span> if named subexpression <span class="emphasis"><em>name</em></span>
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has been matched, otherwise executes <span class="emphasis"><em>no-pattern</em></span>.
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</li>
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<li class="listitem">
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<code class="literal">(?(R)yes-pattern|no-pattern)</code> Executes <span class="emphasis"><em>yes-pattern</em></span>
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@ -1368,7 +1368,7 @@
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<span class="special">[::]</span> <span class="special">[..]</span></code>
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</li>
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<li class="listitem">
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Escaped characters <code class="literal">\</code>
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Escaped characters [^]
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</li>
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<li class="listitem">
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Character set (bracket expression) <code class="computeroutput"><span class="special">[]</span></code>
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