1<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 2<html> 3<head> 4<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 5<title>Function repeat</title> 6<link rel="stylesheet" href="../../../../doc/src/boostbook.css" type="text/css"> 7<meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> 8<link rel="home" href="../../index.html" title="The Boost C++ Libraries BoostBook Documentation Subset"> 9<link rel="up" href="../../xpressive/reference.html#header.boost.xpressive.regex_primitives_hpp" title="Header <boost/xpressive/regex_primitives.hpp>"> 10<link rel="prev" href="optional.html" title="Function template optional"> 11<link rel="next" href="keep.html" title="Function template keep"> 12</head> 13<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> 14<table cellpadding="2" width="100%"><tr> 15<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../boost.png"></td> 16<td align="center"><a href="../../../../index.html">Home</a></td> 17<td align="center"><a href="../../../../libs/libraries.htm">Libraries</a></td> 18<td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> 19<td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> 20<td align="center"><a href="../../../../more/index.htm">More</a></td> 21</tr></table> 22<hr> 23<div class="spirit-nav"> 24<a accesskey="p" href="optional.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../../xpressive/reference.html#header.boost.xpressive.regex_primitives_hpp"><img src="../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="keep.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a> 25</div> 26<div class="refentry"> 27<a name="boost.xpressive.repeat"></a><div class="titlepage"></div> 28<div class="refnamediv"> 29<h2><span class="refentrytitle">Function repeat</span></h2> 30<p>boost::xpressive::repeat — Repeat a sub-expression multiple times. </p> 31</div> 32<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2> 33<div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: <<a class="link" href="../../xpressive/reference.html#header.boost.xpressive.regex_primitives_hpp" title="Header <boost/xpressive/regex_primitives.hpp>">boost/xpressive/regex_primitives.hpp</a>> 34 35</span> 36<span class="keyword">template</span><span class="special"><</span><span class="keyword">unsigned</span> <span class="keyword">int</span> Min<span class="special">,</span> <span class="keyword">unsigned</span> <span class="keyword">int</span> Max<span class="special">,</span> <span class="keyword">typename</span> <a class="link" href="../../Expr.html" title="Concept Expr">Expr</a><span class="special">></span> 37 <span class="emphasis"><em><span class="identifier">unspecified</span></em></span> <span class="identifier">repeat</span><span class="special">(</span><span class="identifier">Expr</span> <span class="keyword">const</span> <span class="special">&</span> expr<span class="special">)</span><span class="special">;</span> 38<span class="keyword">template</span><span class="special"><</span><span class="keyword">unsigned</span> <span class="keyword">int</span> Count<span class="special">,</span> <span class="keyword">typename</span> <a class="link" href="../../Expr.html" title="Concept Expr">Expr2</a><span class="special">></span> 39 <span class="emphasis"><em><span class="identifier">unspecified</span></em></span> <span class="identifier">repeat</span><span class="special">(</span><span class="identifier">Expr2</span> <span class="keyword">const</span> <span class="special">&</span> expr2<span class="special">)</span><span class="special">;</span></pre></div> 40<div class="refsect1"> 41<a name="id-1.3.47.5.10.58.4"></a><h2>Description</h2> 42<p>There are two forms of the repeat<>() function template. To match a sub-expression N times, use repeat<N>(expr). To match a sub-expression from M to N times, use repeat<M,N>(expr).</p> 43<p>The repeat<>() function creates a greedy quantifier. To make the quantifier non-greedy, apply the unary minus operator, as in -repeat<M,N>(expr).</p> 44<p> 45</p> 46<div class="variablelist"><table border="0" class="variablelist compact"> 47<colgroup> 48<col align="left" valign="top"> 49<col> 50</colgroup> 51<tbody><tr> 52<td><p><span class="term">Parameters:</span></p></td> 53<td><div class="variablelist"><table border="0" class="variablelist compact"> 54<colgroup> 55<col align="left" valign="top"> 56<col> 57</colgroup> 58<tbody><tr> 59<td><p><span class="term"><code class="computeroutput">expr</code></span></p></td> 60<td><p>The sub-expression to repeat. </p></td> 61</tr></tbody> 62</table></div></td> 63</tr></tbody> 64</table></div> 65</div> 66</div> 67<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 68<td align="left"></td> 69<td align="right"><div class="copyright-footer">Copyright © 2007 Eric Niebler<p> 70 Distributed under the Boost Software License, Version 1.0. (See accompanying 71 file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>) 72 </p> 73</div></td> 74</tr></table> 75<hr> 76<div class="spirit-nav"> 77<a accesskey="p" href="optional.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../../xpressive/reference.html#header.boost.xpressive.regex_primitives_hpp"><img src="../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="keep.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a> 78</div> 79</body> 80</html> 81
