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| 24 | </div> | |
| 25 | <div class="section"> | |
| 26 | <div class="titlepage"><div><div><h4 class="title"> | |
| 27 | <a name="boost_regex.ref.deprecated_interfaces.regex_split"></a><a class="link" href="regex_split.html" title="regex_split (deprecated)">regex_split | |
| 28 | (deprecated)</a> | |
| 29 | </h4></div></div></div> | |
| 30 | <p> | |
| 31 | The algorithm <a class="link" href="regex_split.html" title="regex_split (deprecated)"><code class="computeroutput"><span class="identifier">regex_split</span></code></a> has been deprecated | |
| 32 | in favor of the iterator <a class="link" href="../regex_token_iterator.html" title="regex_token_iterator"><code class="computeroutput"><span class="identifier">regex_token_iterator</span></code></a> which has | |
| 33 | a more flexible and powerful interface, as well as following the more usual | |
| 34 | standard library "pull" rather than "push" semantics. | |
| 35 | </p> | |
| 36 | <p> | |
| 37 | Code which uses <a class="link" href="regex_split.html" title="regex_split (deprecated)"><code class="computeroutput"><span class="identifier">regex_split</span></code></a> will continue to compile, | |
| 38 | the following documentation is taken from a previous Boost.Regex version: | |
| 39 | </p> | |
| 40 | <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> | |
| 41 | </pre> | |
| 42 | <p> | |
| 43 | Algorithm <a class="link" href="regex_split.html" title="regex_split (deprecated)"><code class="computeroutput"><span class="identifier">regex_split</span></code></a> performs a similar | |
| 44 | operation to the perl split operation, and comes in three overloaded forms: | |
| 45 | </p> | |
| 46 | <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">charT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Traits1</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Alloc1</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Traits2</span><span class="special">></span> | |
| 47 | <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">regex_split</span><span class="special">(</span><span class="identifier">OutputIterator</span> <span class="identifier">out</span><span class="special">,</span> | |
| 48 | <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special"><</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">Traits1</span><span class="special">,</span> <span class="identifier">Alloc1</span><span class="special">>&</span> <span class="identifier">s</span><span class="special">,</span> | |
| 49 | <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">Traits2</span><span class="special">>&</span> <span class="identifier">e</span><span class="special">,</span> | |
| 50 | <span class="identifier">boost</span><span class="special">::</span><span class="identifier">match_flag_type</span> <span class="identifier">flags</span><span class="special">,</span> | |
| 51 | <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">max_split</span><span class="special">);</span> | |
| 52 | ||
| 53 | <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">charT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Traits1</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Alloc1</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Traits2</span><span class="special">></span> | |
| 54 | <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">regex_split</span><span class="special">(</span><span class="identifier">OutputIterator</span> <span class="identifier">out</span><span class="special">,</span> | |
| 55 | <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special"><</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">Traits1</span><span class="special">,</span> <span class="identifier">Alloc1</span><span class="special">>&</span> <span class="identifier">s</span><span class="special">,</span> | |
| 56 | <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">Traits2</span><span class="special">>&</span> <span class="identifier">e</span><span class="special">,</span> | |
| 57 | <span class="identifier">boost</span><span class="special">::</span><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> | |
| 58 | ||
| 59 | <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">charT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Traits1</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Alloc1</span><span class="special">></span> | |
| 60 | <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">regex_split</span><span class="special">(</span><span class="identifier">OutputIterator</span> <span class="identifier">out</span><span class="special">,</span> | |
| 61 | <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special"><</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">Traits1</span><span class="special">,</span> <span class="identifier">Alloc1</span><span class="special">>&</span> <span class="identifier">s</span><span class="special">);</span> | |
| 62 | </pre> | |
| 63 | <p> | |
| 64 | <span class="bold"><strong>Effects</strong></span>: Each version of the algorithm | |
| 65 | takes an output-iterator for output, and a string for input. If the expression | |
| 66 | contains no marked sub-expressions, then the algorithm writes one string | |
| 67 | onto the output-iterator for each section of input that does not match | |
| 68 | the expression. If the expression does contain marked sub-expressions, | |
| 69 | then each time a match is found, one string for each marked sub-expression | |
| 70 | will be written to the output-iterator. No more than max_split strings | |
| 71 | will be written to the output-iterator. Before returning, all the input | |
| 72 | processed will be deleted from the string <span class="emphasis"><em>s</em></span> (if <span class="emphasis"><em>max_split</em></span> | |
| 73 | is not reached then all of <span class="emphasis"><em>s</em></span> will be deleted). Returns | |
| 74 | the number of strings written to the output-iterator. If the parameter | |
| 75 | <span class="emphasis"><em>max_split</em></span> is not specified then it defaults to <code class="computeroutput"><span class="identifier">UINT_MAX</span></code>. If no expression is specified, | |
| 76 | then it defaults to "\s+", and splitting occurs on whitespace. | |
| 77 | </p> | |
| 78 | <p> | |
| 79 | <span class="bold"><strong>Throws</strong></span>: <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">runtime_error</span></code> | |
| 80 | if the complexity of matching the expression against an N character string | |
| 81 | begins to exceed O(N<sup>2</sup>), or if the program runs out of stack space while | |
| 82 | matching the expression (if Boost.Regex is configured in recursive mode), | |
| 83 | or if the matcher exhausts its permitted memory allocation (if Boost.Regex | |
| 84 | is configured in non-recursive mode). | |
| 85 | </p> | |
| 86 | <p> | |
| 87 | <span class="bold"><strong>Example</strong></span>: the following function will split | |
| 88 | the input string into a series of tokens, and remove each token from the | |
| 89 | string <span class="emphasis"><em>s</em></span>: | |
| 90 | </p> | |
| 91 | <pre class="programlisting"><span class="keyword">unsigned</span> <span class="identifier">tokenise</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">list</span><span class="special"><</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">>&</span> <span class="identifier">l</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">&</span> <span class="identifier">s</span><span class="special">)</span> | |
| 92 | <span class="special">{</span> | |
| 93 | <span class="keyword">return</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">regex_split</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">back_inserter</span><span class="special">(</span><span class="identifier">l</span><span class="special">),</span> <span class="identifier">s</span><span class="special">);</span> | |
| 94 | <span class="special">}</span> | |
| 95 | </pre> | |
| 96 | <p> | |
| 97 | Example: the following short program will extract all of the URL's from | |
| 98 | a html file, and print them out to cout: | |
| 99 | </p> | |
| 100 | <pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">list</span><span class="special">></span> | |
| 101 | <span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">fstream</span><span class="special">></span> | |
| 102 | <span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">iostream</span><span class="special">></span> | |
| 103 | <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> | |
| 104 | ||
| 105 | <span class="identifier">boost</span><span class="special">::</span><span class="identifier">regex</span> <span class="identifier">e</span><span class="special">(</span><span class="string">"<\\s*A\\s+[^>]*href\\s*=\\s*\"([^\"]*)\""</span><span class="special">,</span> | |
| 106 | <span class="identifier">boost</span><span class="special">::</span><span class="identifier">regbase</span><span class="special">::</span><span class="identifier">normal</span> <span class="special">|</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">regbase</span><span class="special">::</span><span class="identifier">icase</span><span class="special">);</span> | |
| 107 | ||
| 108 | <span class="keyword">void</span> <span class="identifier">load_file</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">&</span> <span class="identifier">s</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">istream</span><span class="special">&</span> <span class="identifier">is</span><span class="special">)</span> | |
| 109 | <span class="special">{</span> | |
| 110 | <span class="identifier">s</span><span class="special">.</span><span class="identifier">erase</span><span class="special">();</span> | |
| 111 | <span class="comment">//</span> | |
| 112 | <span class="comment">// attempt to grow string buffer to match file size,</span> | |
| 113 | <span class="comment">// this doesn't always work...</span> | |
| 114 | <span class="identifier">s</span><span class="special">.</span><span class="identifier">reserve</span><span class="special">(</span><span class="identifier">is</span><span class="special">.</span><span class="identifier">rdbuf</span><span class="special">()-&</span><span class="identifier">gtin_avail</span><span class="special">());</span> | |
| 115 | <span class="keyword">char</span> <span class="identifier">c</span><span class="special">;</span> | |
| 116 | <span class="keyword">while</span><span class="special">(</span><span class="identifier">is</span><span class="special">.</span><span class="identifier">get</span><span class="special">(</span><span class="identifier">c</span><span class="special">))</span> | |
| 117 | <span class="special">{</span> | |
| 118 | <span class="comment">// use logarithmic growth strategy, in case</span> | |
| 119 | <span class="comment">// in_avail (above) returned zero:</span> | |
| 120 | <span class="keyword">if</span><span class="special">(</span><span class="identifier">s</span><span class="special">.</span><span class="identifier">capacity</span><span class="special">()</span> <span class="special">==</span> <span class="identifier">s</span><span class="special">.</span><span class="identifier">size</span><span class="special">())</span> | |
| 121 | <span class="identifier">s</span><span class="special">.</span><span class="identifier">reserve</span><span class="special">(</span><span class="identifier">s</span><span class="special">.</span><span class="identifier">capacity</span><span class="special">()</span> <span class="special">*</span> <span class="number">3</span><span class="special">);</span> | |
| 122 | <span class="identifier">s</span><span class="special">.</span><span class="identifier">append</span><span class="special">(</span><span class="number">1</span><span class="special">,</span> <span class="identifier">c</span><span class="special">);</span> | |
| 123 | <span class="special">}</span> | |
| 124 | <span class="special">}</span> | |
| 125 | ||
| 126 | ||
| 127 | <span class="keyword">int</span> <span class="identifier">main</span><span class="special">(</span><span class="keyword">int</span> <span class="identifier">argc</span><span class="special">,</span> <span class="keyword">char</span><span class="special">**</span> <span class="identifier">argv</span><span class="special">)</span> | |
| 128 | <span class="special">{</span> | |
| 129 | <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="identifier">s</span><span class="special">;</span> | |
| 130 | <span class="identifier">std</span><span class="special">::</span><span class="identifier">list</span><span class="special"><</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">></span> <span class="identifier">l</span><span class="special">;</span> | |
| 131 | ||
| 132 | <span class="keyword">for</span><span class="special">(</span><span class="keyword">int</span> <span class="identifier">i</span> <span class="special">=</span> <span class="number">1</span><span class="special">;</span> <span class="identifier">i</span> <span class="special"><</span> <span class="identifier">argc</span><span class="special">;</span> <span class="special">++</span><span class="identifier">i</span><span class="special">)</span> | |
| 133 | <span class="special">{</span> | |
| 134 | <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="string">"Findings URL's in "</span> <span class="special"><<</span> <span class="identifier">argv</span><span class="special">[</span><span class="identifier">i</span><span class="special">]</span> <span class="special"><<</span> <span class="string">":"</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span> | |
| 135 | <span class="identifier">s</span><span class="special">.</span><span class="identifier">erase</span><span class="special">();</span> | |
| 136 | <span class="identifier">std</span><span class="special">::</span><span class="identifier">ifstream</span> <span class="identifier">is</span><span class="special">(</span><span class="identifier">argv</span><span class="special">[</span><span class="identifier">i</span><span class="special">]);</span> | |
| 137 | <span class="identifier">load_file</span><span class="special">(</span><span class="identifier">s</span><span class="special">,</span> <span class="identifier">is</span><span class="special">);</span> | |
| 138 | <span class="identifier">boost</span><span class="special">::</span><span class="identifier">regex_split</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">back_inserter</span><span class="special">(</span><span class="identifier">l</span><span class="special">),</span> <span class="identifier">s</span><span class="special">,</span> <span class="identifier">e</span><span class="special">);</span> | |
| 139 | <span class="keyword">while</span><span class="special">(</span><span class="identifier">l</span><span class="special">.</span><span class="identifier">size</span><span class="special">())</span> | |
| 140 | <span class="special">{</span> | |
| 141 | <span class="identifier">s</span> <span class="special">=</span> <span class="special">*(</span><span class="identifier">l</span><span class="special">.</span><span class="identifier">begin</span><span class="special">());</span> | |
| 142 | <span class="identifier">l</span><span class="special">.</span><span class="identifier">pop_front</span><span class="special">();</span> | |
| 143 | <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="identifier">s</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span> | |
| 144 | <span class="special">}</span> | |
| 145 | <span class="special">}</span> | |
| 146 | <span class="keyword">return</span> <span class="number">0</span><span class="special">;</span> | |
| 147 | <span class="special">}</span> | |
| 148 | </pre> | |
| 149 | </div> | |
| 150 | <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> | |
| 151 | <td align="left"></td> | |
| 152 | <td align="right"><div class="copyright-footer">Copyright © 1998-2013 John Maddock<p> | |
| 153 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
| 154 | 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>) | |
| 155 | </p> | |
| 156 | </div></td> | |
| 157 | </tr></table> | |
| 158 | <hr> | |
| 159 | <div class="spirit-nav"> | |
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