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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>regex_replace</title>
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@ -24,23 +24,21 @@
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</div>
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<div class="section" lang="en">
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<div class="titlepage"><div><div><h3 class="title">
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<a name="boost_regex.ref.regex_replace"></a><a class="link" href="regex_replace.html" title="regex_replace"> regex_replace</a>
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<a name="boost_regex.ref.regex_replace"></a><a href="regex_replace.html" title="regex_replace"> regex_replace</a>
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</h3></div></div></div>
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<pre class="programlisting">
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<span class="preprocessor">#include</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">hpp</span><span class="special">></span>
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<pre class="programlisting"><span class="preprocessor">#include</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">hpp</span><span class="special">></span>
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</pre>
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<p>
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The algorithm <a class="link" href="regex_replace.html" title="regex_replace"><code class="computeroutput"><span class="identifier">regex_replace</span></code></a> searches through a
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The algorithm <a href="regex_replace.html" title="regex_replace"><code class="computeroutput"><span class="identifier">regex_replace</span></code></a> searches through a
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string finding all the matches to the regular expression: for each match
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it then calls <a class="link" href="match_results.html#boost_regex.match_results_format"><code class="computeroutput"><span class="identifier">match_results</span><span class="special"><>::</span><span class="identifier">format</span></code></a> to format the string and
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it then calls <a href="match_results.html#boost_regex.match_results_format"><code class="computeroutput"><span class="identifier">match_results</span><span class="special"><>::</span><span class="identifier">format</span></code></a> to format the string and
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sends the result to the output iterator. Sections of text that do not match
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are copied to the output unchanged only if the <span class="emphasis"><em>flags</em></span>
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parameter does not have the flag <code class="computeroutput"><span class="identifier">format_no_copy</span></code>
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set. If the flag <code class="computeroutput"><span class="identifier">format_first_only</span></code>
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is set then only the first occurrence is replaced rather than all occurrences.
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</p>
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<pre class="programlisting">
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<span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">OutputIterator</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">BidirectionalIterator</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">traits</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">charT</span><span class="special">></span>
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<pre class="programlisting"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">OutputIterator</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">BidirectionalIterator</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">traits</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">charT</span><span class="special">></span>
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<span class="identifier">OutputIterator</span> <span class="identifier">regex_replace</span><span class="special">(</span><span class="identifier">OutputIterator</span> <span class="identifier">out</span><span class="special">,</span>
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<span class="identifier">BidirectionalIterator</span> <span class="identifier">first</span><span class="special">,</span>
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<span class="identifier">BidirectionalIterator</span> <span class="identifier">last</span><span class="special">,</span>
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@ -55,11 +53,10 @@
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<span class="identifier">match_flag_type</span> <span class="identifier">flags</span> <span class="special">=</span> <span class="identifier">match_default</span><span class="special">);</span>
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</pre>
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<a name="boost_regex.ref.regex_replace.description"></a><h5>
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<a name="id2711652"></a>
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<a class="link" href="regex_replace.html#boost_regex.ref.regex_replace.description">Description</a>
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<a name="id574547"></a>
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<a href="regex_replace.html#boost_regex.ref.regex_replace.description">Description</a>
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</h5>
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<pre class="programlisting">
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<span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">OutputIterator</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">BidirectionalIterator</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">traits</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">charT</span><span class="special">></span>
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<pre class="programlisting"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">OutputIterator</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">BidirectionalIterator</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">traits</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">charT</span><span class="special">></span>
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<span class="identifier">OutputIterator</span> <span class="identifier">regex_replace</span><span class="special">(</span><span class="identifier">OutputIterator</span> <span class="identifier">out</span><span class="special">,</span>
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<span class="identifier">BidirectionalIterator</span> <span class="identifier">first</span><span class="special">,</span>
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<span class="identifier">BidirectionalIterator</span> <span class="identifier">last</span><span class="special">,</span>
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@ -86,61 +83,53 @@
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<p>
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The manner in which the format string <span class="emphasis"><em>fmt</em></span> is interpretted,
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along with the rules used for finding matches, are determined by the flags
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set in <span class="emphasis"><em>flags</em></span>: see <a class="link" href="match_flag_type.html" title="match_flag_type"><code class="computeroutput"><span class="identifier">match_flag_type</span></code></a>.
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set in <span class="emphasis"><em>flags</em></span>: see <a href="match_flag_type.html" title="match_flag_type"><code class="computeroutput"><span class="identifier">match_flag_type</span></code></a>.
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</p>
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<p>
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<span class="bold"><strong>Effects</strong></span>: Constructs an <a class="link" href="regex_iterator.html" title="regex_iterator"><code class="computeroutput"><span class="identifier">regex_iterator</span></code></a> object:
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<span class="bold"><strong>Effects</strong></span>: Constructs an <a href="regex_iterator.html" title="regex_iterator"><code class="computeroutput"><span class="identifier">regex_iterator</span></code></a> object:
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</p>
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<pre class="programlisting">
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<span class="identifier">regex_iterator</span><span class="special"><</span><span class="identifier">BidirectionalIterator</span><span class="special">,</span> <span class="identifier">charT</span><span class="special">,</span> <span class="identifier">traits</span><span class="special">,</span> <span class="identifier">Allocator</span><span class="special">></span>
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<pre class="programlisting"><span class="identifier">regex_iterator</span><span class="special"><</span><span class="identifier">BidirectionalIterator</span><span class="special">,</span> <span class="identifier">charT</span><span class="special">,</span> <span class="identifier">traits</span><span class="special">,</span> <span class="identifier">Allocator</span><span class="special">></span>
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<span class="identifier">i</span><span class="special">(</span><span class="identifier">first</span><span class="special">,</span> <span class="identifier">last</span><span class="special">,</span> <span class="identifier">e</span><span class="special">,</span> <span class="identifier">flags</span><span class="special">),</span>
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</pre>
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<p>
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and uses <span class="emphasis"><em>i</em></span> to enumerate through all of the matches
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<span class="emphasis"><em>m</em></span> of type <a class="link" href="match_results.html" title="match_results"><code class="computeroutput"><span class="identifier">match_results</span></code></a> <code class="computeroutput"><span class="special"><</span><span class="identifier">BidirectionalIterator</span><span class="special">></span></code>
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<span class="emphasis"><em>m</em></span> of type <a href="match_results.html" title="match_results"><code class="computeroutput"><span class="identifier">match_results</span></code></a> <code class="computeroutput"><span class="special"><</span><span class="identifier">BidirectionalIterator</span><span class="special">></span></code>
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that occur within the sequence [first, last).
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</p>
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<p>
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If no such matches are found and
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</p>
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<pre class="programlisting">
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<span class="special">!(</span><span class="identifier">flags</span> <span class="special">&</span> <span class="identifier">format_no_copy</span><span class="special">)</span>
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<pre class="programlisting"><span class="special">!(</span><span class="identifier">flags</span> <span class="special">&</span> <span class="identifier">format_no_copy</span><span class="special">)</span>
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</pre>
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<p>
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then calls
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</p>
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<pre class="programlisting">
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<span class="identifier">std</span><span class="special">::</span><span class="identifier">copy</span><span class="special">(</span><span class="identifier">first</span><span class="special">,</span> <span class="identifier">last</span><span class="special">,</span> <span class="identifier">out</span><span class="special">).</span>
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<pre class="programlisting"><span class="identifier">std</span><span class="special">::</span><span class="identifier">copy</span><span class="special">(</span><span class="identifier">first</span><span class="special">,</span> <span class="identifier">last</span><span class="special">,</span> <span class="identifier">out</span><span class="special">).</span>
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</pre>
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<p>
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Otherwise, for each match found, if
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</p>
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<pre class="programlisting">
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<span class="special">!(</span><span class="identifier">flags</span> <span class="special">&</span> <span class="identifier">format_no_copy</span><span class="special">)</span>
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<pre class="programlisting"><span class="special">!(</span><span class="identifier">flags</span> <span class="special">&</span> <span class="identifier">format_no_copy</span><span class="special">)</span>
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</pre>
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<p>
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calls
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</p>
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<pre class="programlisting">
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<span class="identifier">std</span><span class="special">::</span><span class="identifier">copy</span><span class="special">(</span><span class="identifier">m</span><span class="special">.</span><span class="identifier">prefix</span><span class="special">().</span><span class="identifier">first</span><span class="special">,</span> <span class="identifier">m</span><span class="special">.</span><span class="identifier">prefix</span><span class="special">().</span><span class="identifier">last</span><span class="special">,</span> <span class="identifier">out</span><span class="special">),</span>
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<pre class="programlisting"><span class="identifier">std</span><span class="special">::</span><span class="identifier">copy</span><span class="special">(</span><span class="identifier">m</span><span class="special">.</span><span class="identifier">prefix</span><span class="special">().</span><span class="identifier">first</span><span class="special">,</span> <span class="identifier">m</span><span class="special">.</span><span class="identifier">prefix</span><span class="special">().</span><span class="identifier">last</span><span class="special">,</span> <span class="identifier">out</span><span class="special">),</span>
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</pre>
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<p>
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and then calls
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</p>
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<pre class="programlisting">
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<span class="identifier">m</span><span class="special">.</span><span class="identifier">format</span><span class="special">(</span><span class="identifier">out</span><span class="special">,</span> <span class="identifier">fmt</span><span class="special">,</span> <span class="identifier">flags</span><span class="special">).</span>
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<pre class="programlisting"><span class="identifier">m</span><span class="special">.</span><span class="identifier">format</span><span class="special">(</span><span class="identifier">out</span><span class="special">,</span> <span class="identifier">fmt</span><span class="special">,</span> <span class="identifier">flags</span><span class="special">).</span>
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</pre>
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<p>
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Finally if
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</p>
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<pre class="programlisting">
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<span class="special">!(</span><span class="identifier">flags</span> <span class="special">&</span> <span class="identifier">format_no_copy</span><span class="special">)</span>
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<pre class="programlisting"><span class="special">!(</span><span class="identifier">flags</span> <span class="special">&</span> <span class="identifier">format_no_copy</span><span class="special">)</span>
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</pre>
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<p>
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calls
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</p>
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<pre class="programlisting">
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<span class="identifier">std</span><span class="special">::</span><span class="identifier">copy</span><span class="special">(</span><span class="identifier">last_m</span><span class="special">.</span><span class="identifier">suffix</span><span class="special">().</span><span class="identifier">first</span><span class="special">,</span> <span class="identifier">last_m</span><span class="special">,</span><span class="identifier">suffix</span><span class="special">().</span><span class="identifier">last</span><span class="special">,</span> <span class="identifier">out</span><span class="special">)</span>
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<pre class="programlisting"><span class="identifier">std</span><span class="special">::</span><span class="identifier">copy</span><span class="special">(</span><span class="identifier">last_m</span><span class="special">.</span><span class="identifier">suffix</span><span class="special">().</span><span class="identifier">first</span><span class="special">,</span> <span class="identifier">last_m</span><span class="special">,</span><span class="identifier">suffix</span><span class="special">().</span><span class="identifier">last</span><span class="special">,</span> <span class="identifier">out</span><span class="special">)</span>
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</pre>
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<p>
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where <span class="emphasis"><em>last_m</em></span> is a copy of the last match found.
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@ -161,8 +150,7 @@
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<p>
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<span class="bold"><strong>Returns</strong></span>: out.
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</p>
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<pre class="programlisting">
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<span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">traits</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">charT</span><span class="special">></span>
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<pre class="programlisting"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">traits</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">charT</span><span class="special">></span>
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<span class="identifier">basic_string</span><span class="special"><</span><span class="identifier">charT</span><span class="special">></span> <span class="identifier">regex_replace</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">basic_string</span><span class="special"><</span><span class="identifier">charT</span><span class="special">>&</span> <span class="identifier">s</span><span class="special">,</span>
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<span class="keyword">const</span> <span class="identifier">basic_regex</span><span class="special"><</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">traits</span><span class="special">>&</span> <span class="identifier">e</span><span class="special">,</span>
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<span class="keyword">const</span> <span class="identifier">basic_string</span><span class="special"><</span><span class="identifier">charT</span><span class="special">>&</span> <span class="identifier">fmt</span><span class="special">,</span>
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@ -175,15 +163,14 @@
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and then returns <code class="computeroutput"><span class="identifier">result</span></code>.
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</p>
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<a name="boost_regex.ref.regex_replace.examples"></a><h5>
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<a name="id2713068"></a>
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<a class="link" href="regex_replace.html#boost_regex.ref.regex_replace.examples">Examples</a>
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<a name="id576096"></a>
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<a href="regex_replace.html#boost_regex.ref.regex_replace.examples">Examples</a>
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</h5>
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<p>
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The following example takes C/C++ source code as input, and outputs syntax
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highlighted HTML code.
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</p>
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<pre class="programlisting">
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<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">fstream</span><span class="special">></span>
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<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">fstream</span><span class="special">></span>
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<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">sstream</span><span class="special">></span>
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<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">string</span><span class="special">></span>
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<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">iterator</span><span class="special">></span>
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