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<title>Search and Replace Format String Syntax</title>
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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="boost_regex.format"></a><a class="link" href="format.html" title="Search and Replace Format String Syntax">Search and Replace Format String Syntax</a>
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<dt><span class="section"><a href="format/sed_format.html">Sed Format String Syntax</a></span></dt>
<dt><span class="section"><a href="format/perl_format.html">Perl Format String Syntax</a></span></dt>
<dt><span class="section"><a href="format/boost_format_syntax.html">Boost-Extended
      Format String Syntax</a></span></dt>
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<p>
      Format strings are used by the algorithm <a class="link" href="ref/regex_replace.html" title="regex_replace"><code class="computeroutput"><span class="identifier">regex_replace</span></code></a> and by <a class="link" href="ref/match_results.html#boost_regex.match_results_format"><code class="computeroutput"><span class="identifier">match_results</span><span class="special">&lt;&gt;::</span><span class="identifier">format</span></code></a>, and are used to transform
      one string into another.
    </p>
<p>
      There are three kind of format string: <a class="link" href="format/sed_format.html" title="Sed Format String Syntax">Sed</a>,
      <a class="link" href="format/perl_format.html" title="Perl Format String Syntax">Perl</a> and <a class="link" href="format/boost_format_syntax.html" title="Boost-Extended Format String Syntax">Boost-Extended</a>.
    </p>
<p>
      Alternatively, when the flag <code class="computeroutput"><span class="identifier">format_literal</span></code>
      is passed to one of these functions, then the format string is treated as a
      string literal, and is copied unchanged to the output.
    </p>
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