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| 28 | <h2><span class="refentrytitle">Global s1</span></h2> |
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| 29 | <p>boost::xpressive::s1 — Sub-match placeholder, like $1 in perl. </p> |
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| 31 | <h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2> |
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| 32 | <div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="emphasis"><em>unspecified</em></span> s1;</pre></div> |
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| 33 | <div class="refsect1" lang="en"> |
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| 34 | <a name="id2047292"></a><h2>Description</h2> |
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| 35 | <p>To create a sub-match, assign a sub-expression to the sub-match placeholder. For instance, (s1= _) will match any one character and remember which character was matched in the 1st sub-match. Later in the pattern, you can refer back to the sub-match. For instance, (s1= _) >> s1 will match any character, and then match the same character again.</p> |
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| 36 | <p>After a successful regex_match() or regex_search(), the sub-match placeholders can be used to index into the match_results<> object to retrieve the Nth sub-match. </p> |
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| 41 | <td align="right"><small>Copyright © 2003, 2004 Eric Niebler</small></td> |
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