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  26 <div class="titlepage"><div><div><h3 class="title">
  27 <a name="boost_regex.ref.regex_replace"></a><a class="link" href="regex_replace.html" title="regex_replace">regex_replace</a>
  28 </h3></div></div></div>
  29 <pre class="programlisting"><span class="preprocessor">#include</span> <span class="special">&lt;</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">&gt;</span>
  30 </pre>
  31 <p>
  32         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
  33         string finding all the matches to the regular expression: for each match
  34         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">&lt;&gt;::</span><span class="identifier">format</span></code></a> to format the string and
  35         sends the result to the output iterator. Sections of text that do not match
  36         are copied to the output unchanged only if the <span class="emphasis"><em>flags</em></span>
  37         parameter does not have the flag <code class="computeroutput"><span class="identifier">format_no_copy</span></code>
  38         set. If the flag <code class="computeroutput"><span class="identifier">format_first_only</span></code>
  39         is set then only the first occurrence is replaced rather than all occurrences.
  40       </p>
  41 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</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">Formatter</span><span class="special">&gt;</span>
  42 <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>
  43                              <span class="identifier">BidirectionalIterator</span> <span class="identifier">first</span><span class="special">,</span>
  44                              <span class="identifier">BidirectionalIterator</span> <span class="identifier">last</span><span class="special">,</span>
  45                              <span class="keyword">const</span> <span class="identifier">basic_regex</span><span class="special">&lt;</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">traits</span><span class="special">&gt;&amp;</span> <span class="identifier">e</span><span class="special">,</span>
  46                              <span class="identifier">Formatter</span> <span class="identifier">fmt</span><span class="special">,</span>
  47                              <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>
  48
  49 <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">traits</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Formatter</span><span class="special">&gt;</span>
  50 <span class="identifier">basic_string</span><span class="special">&lt;</span><span class="identifier">charT</span><span class="special">&gt;</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">&lt;</span><span class="identifier">charT</span><span class="special">&gt;&amp;</span> <span class="identifier">s</span><span class="special">,</span>
  51                                   <span class="keyword">const</span> <span class="identifier">basic_regex</span><span class="special">&lt;</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">traits</span><span class="special">&gt;&amp;</span> <span class="identifier">e</span><span class="special">,</span>
  52                                   <span class="identifier">Formatter</span> <span class="identifier">fmt</span><span class="special">,</span>
  53                                   <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>
  54 </pre>
  55 <h5>
  56 <a name="boost_regex.ref.regex_replace.h0"></a>
  57         <span class="phrase"><a name="boost_regex.ref.regex_replace.description"></a></span><a class="link" href="regex_replace.html#boost_regex.ref.regex_replace.description">Description</a>
  58       </h5>
  59 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</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">Formatter</span><span class="special">&gt;</span>
  60 <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>
  61                              <span class="identifier">BidirectionalIterator</span> <span class="identifier">first</span><span class="special">,</span>
  62                              <span class="identifier">BidirectionalIterator</span> <span class="identifier">last</span><span class="special">,</span>
  63                              <span class="keyword">const</span> <span class="identifier">basic_regex</span><span class="special">&lt;</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">traits</span><span class="special">&gt;&amp;</span> <span class="identifier">e</span><span class="special">,</span>
  64                              <span class="identifier">Formatter</span> <span class="identifier">fmt</span><span class="special">,</span>
  65                              <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>
  66 </pre>
  67 <p>
  68         Enumerates all the occurrences of expression <span class="emphasis"><em>e</em></span> in the
  69         sequence [first, last), replacing each occurrence with the string that results
  70         by merging the match found with the format string <span class="emphasis"><em>fmt</em></span>,
  71         and copies the resulting string to <span class="emphasis"><em>out</em></span>. In the case
  72         that <span class="emphasis"><em>fmt</em></span> is a unary, binary or ternary function object,
  73         then the character sequence generated by that object is copied unchanged
  74         to the output when performing a substitution.
  75       </p>
  76 <p>
  77         If the flag <code class="computeroutput"><span class="identifier">format_no_copy</span></code>
  78         is set in <span class="emphasis"><em>flags</em></span> then unmatched sections of text are
  79         not copied to output.
  80       </p>
  81 <p>
  82         If the flag <code class="computeroutput"><span class="identifier">format_first_only</span></code>
  83         is set in flags then only the first occurrence of <span class="emphasis"><em>e</em></span>
  84         is replaced.
  85       </p>
  86 <p>
  87         The manner in which the format string <span class="emphasis"><em>fmt</em></span> is interpreted,
  88         along with the rules used for finding matches, are determined by the flags
  89         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>.
  90       </p>
  91 <p>
  92         <span class="bold"><strong>Requires</strong></span> The type <code class="computeroutput"><span class="identifier">Formatter</span></code>
  93         must be either a pointer to a null-terminated string of type <code class="computeroutput"><span class="identifier">char_type</span><span class="special">[]</span></code>,
  94         or be a container of <code class="computeroutput"><span class="identifier">char_type</span></code>'s
  95         (for example <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special">&lt;</span><span class="identifier">char_type</span><span class="special">&gt;</span></code>)
  96         or be a unary, binary or ternary functor that computes the replacement string
  97         from a function call: either <code class="computeroutput"><span class="identifier">fmt</span><span class="special">(</span><span class="identifier">what</span><span class="special">)</span></code>
  98         which must return a container of <code class="computeroutput"><span class="identifier">char_type</span></code>'s
  99         to be used as the replacement text, or either <code class="computeroutput"><span class="identifier">fmt</span><span class="special">(</span><span class="identifier">what</span><span class="special">,</span>
 100         <span class="identifier">out</span><span class="special">)</span></code>
 101         or <code class="computeroutput"><span class="identifier">fmt</span><span class="special">(</span><span class="identifier">what</span><span class="special">,</span> <span class="identifier">out</span><span class="special">,</span> <span class="identifier">flags</span><span class="special">)</span></code>, both of which write the replacement text
 102         to <code class="computeroutput"><span class="special">*</span><span class="identifier">out</span></code>,
 103         and then return the new OutputIterator position. In each case <code class="computeroutput"><span class="identifier">what</span></code> is the <a class="link" href="match_results.html" title="match_results"><code class="computeroutput"><span class="identifier">match_results</span></code></a> object that represents
 104         the match found. Note that if the formatter is a functor, then it is <span class="emphasis"><em>passed
 105         by value</em></span>: users that want to pass function objects with internal
 106         state might want to use <a href="../../../../../../doc/html/ref.html" target="_top">Boost.Ref</a>
 107         to wrap the object so that it's passed by reference.
 108       </p>
 109 <p>
 110         <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:
 111       </p>
 112 <pre class="programlisting"><span class="identifier">regex_iterator</span><span class="special">&lt;</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">&gt;</span>
 113                                           <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>
 114 </pre>
 115 <p>
 116         and uses <span class="emphasis"><em>i</em></span> to enumerate through all of the matches
 117         <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">&lt;</span><span class="identifier">BidirectionalIterator</span><span class="special">&gt;</span></code>
 118         that occur within the sequence [first, last).
 119       </p>
 120 <p>
 121         If no such matches are found and
 122       </p>
 123 <pre class="programlisting"><span class="special">!(</span><span class="identifier">flags</span> <span class="special">&amp;</span> <span class="identifier">format_no_copy</span><span class="special">)</span>
 124 </pre>
 125 <p>
 126         then calls
 127       </p>
 128 <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>
 129 </pre>
 130 <p>
 131         Otherwise, for each match found, if
 132       </p>
 133 <pre class="programlisting"><span class="special">!(</span><span class="identifier">flags</span> <span class="special">&amp;</span> <span class="identifier">format_no_copy</span><span class="special">)</span>
 134 </pre>
 135 <p>
 136         calls
 137       </p>
 138 <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>
 139 </pre>
 140 <p>
 141         and then calls
 142       </p>
 143 <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>
 144 </pre>
 145 <p>
 146         Finally if
 147       </p>
 148 <pre class="programlisting"><span class="special">!(</span><span class="identifier">flags</span> <span class="special">&amp;</span> <span class="identifier">format_no_copy</span><span class="special">)</span>
 149 </pre>
 150 <p>
 151         calls
 152       </p>
 153 <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>
 154 </pre>
 155 <p>
 156         where <span class="emphasis"><em>last_m</em></span> is a copy of the last match found.
 157       </p>
 158 <p>
 159         If <code class="computeroutput"><span class="identifier">flags</span> <span class="special">&amp;</span>
 160         <span class="identifier">format_first_only</span></code> is non-zero then
 161         only the first match found is replaced.
 162       </p>
 163 <p>
 164         <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>
 165         if the complexity of matching the expression against an N character string
 166         begins to exceed O(N<sup>2</sup>), or if the program runs out of stack space while matching
 167         the expression (if Boost.Regex is configured in recursive mode), or if the
 168         matcher exhausts its permitted memory allocation (if Boost.Regex is configured
 169         in non-recursive mode).
 170       </p>
 171 <p>
 172         <span class="bold"><strong>Returns</strong></span>: out.
 173       </p>
 174 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">traits</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Formatter</span><span class="special">&gt;</span>
 175 <span class="identifier">basic_string</span><span class="special">&lt;</span><span class="identifier">charT</span><span class="special">&gt;</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">&lt;</span><span class="identifier">charT</span><span class="special">&gt;&amp;</span> <span class="identifier">s</span><span class="special">,</span>
 176                                   <span class="keyword">const</span> <span class="identifier">basic_regex</span><span class="special">&lt;</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">traits</span><span class="special">&gt;&amp;</span> <span class="identifier">e</span><span class="special">,</span>
 177                                   <span class="identifier">Formatter</span> <span class="identifier">fmt</span><span class="special">,</span>
 178                                   <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>
 179 </pre>
 180 <p>
 181         <span class="bold"><strong>Requires</strong></span> The type <code class="computeroutput"><span class="identifier">Formatter</span></code>
 182         must be either a pointer to a null-terminated string of type <code class="computeroutput"><span class="identifier">char_type</span><span class="special">[]</span></code>,
 183         or be a container of <code class="computeroutput"><span class="identifier">char_type</span></code>'s
 184         (for example <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special">&lt;</span><span class="identifier">char_type</span><span class="special">&gt;</span></code>)
 185         or be a unary, binary or ternary functor that computes the replacement string
 186         from a function call: either <code class="computeroutput"><span class="identifier">fmt</span><span class="special">(</span><span class="identifier">what</span><span class="special">)</span></code>
 187         which must return a container of <code class="computeroutput"><span class="identifier">char_type</span></code>'s
 188         to be used as the replacement text, or either <code class="computeroutput"><span class="identifier">fmt</span><span class="special">(</span><span class="identifier">what</span><span class="special">,</span>
 189         <span class="identifier">out</span><span class="special">)</span></code>
 190         or <code class="computeroutput"><span class="identifier">fmt</span><span class="special">(</span><span class="identifier">what</span><span class="special">,</span> <span class="identifier">out</span><span class="special">,</span> <span class="identifier">flags</span><span class="special">)</span></code>, both of which write the replacement text
 191         to <code class="computeroutput"><span class="special">*</span><span class="identifier">out</span></code>,
 192         and then return the new OutputIterator position. In each case <code class="computeroutput"><span class="identifier">what</span></code> is the <a class="link" href="match_results.html" title="match_results"><code class="computeroutput"><span class="identifier">match_results</span></code></a> object that represents
 193         the match found.
 194       </p>
 195 <p>
 196         <span class="bold"><strong>Effects</strong></span>: Constructs an object <code class="computeroutput"><span class="identifier">basic_string</span><span class="special">&lt;</span><span class="identifier">charT</span><span class="special">&gt;</span> <span class="identifier">result</span></code>, calls <code class="computeroutput"><span class="identifier">regex_replace</span><span class="special">(</span><span class="identifier">back_inserter</span><span class="special">(</span><span class="identifier">result</span><span class="special">),</span> <span class="identifier">s</span><span class="special">.</span><span class="identifier">begin</span><span class="special">(),</span> <span class="identifier">s</span><span class="special">.</span><span class="identifier">end</span><span class="special">(),</span> <span class="identifier">e</span><span class="special">,</span>
 197         <span class="identifier">fmt</span><span class="special">,</span>
 198         <span class="identifier">flags</span><span class="special">)</span></code>,
 199         and then returns <code class="computeroutput"><span class="identifier">result</span></code>.
 200       </p>
 201 <h5>
 202 <a name="boost_regex.ref.regex_replace.h1"></a>
 203         <span class="phrase"><a name="boost_regex.ref.regex_replace.examples"></a></span><a class="link" href="regex_replace.html#boost_regex.ref.regex_replace.examples">Examples</a>
 204       </h5>
 205 <p>
 206         The following example takes C/C++ source code as input, and outputs syntax
 207         highlighted HTML code.
 208       </p>
 209 <pre class="programlisting"><span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">fstream</span><span class="special">&gt;</span>
 210 <span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">sstream</span><span class="special">&gt;</span>
 211 <span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">string</span><span class="special">&gt;</span>
 212 <span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">iterator</span><span class="special">&gt;</span>
 213 <span class="preprocessor">#include</span> <span class="special">&lt;</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">&gt;</span>
 214 <span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">fstream</span><span class="special">&gt;</span>
 215 <span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">iostream</span><span class="special">&gt;</span>
 216
 217 <span class="comment">// purpose:</span>
 218 <span class="comment">// takes the contents of a file and transform to</span>
 219 <span class="comment">// syntax highlighted code in html format</span>
 220
 221 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">regex</span> <span class="identifier">e1</span><span class="special">,</span> <span class="identifier">e2</span><span class="special">;</span>
 222 <span class="keyword">extern</span> <span class="keyword">const</span> <span class="keyword">char</span><span class="special">*</span> <span class="identifier">expression_text</span><span class="special">;</span>
 223 <span class="keyword">extern</span> <span class="keyword">const</span> <span class="keyword">char</span><span class="special">*</span> <span class="identifier">format_string</span><span class="special">;</span>
 224 <span class="keyword">extern</span> <span class="keyword">const</span> <span class="keyword">char</span><span class="special">*</span> <span class="identifier">pre_expression</span><span class="special">;</span>
 225 <span class="keyword">extern</span> <span class="keyword">const</span> <span class="keyword">char</span><span class="special">*</span> <span class="identifier">pre_format</span><span class="special">;</span>
 226 <span class="keyword">extern</span> <span class="keyword">const</span> <span class="keyword">char</span><span class="special">*</span> <span class="identifier">header_text</span><span class="special">;</span>
 227 <span class="keyword">extern</span> <span class="keyword">const</span> <span class="keyword">char</span><span class="special">*</span> <span class="identifier">footer_text</span><span class="special">;</span>
 228
 229 <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">&amp;</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">&amp;</span> <span class="identifier">is</span><span class="special">)</span>
 230 <span class="special">{</span>
 231    <span class="identifier">s</span><span class="special">.</span><span class="identifier">erase</span><span class="special">();</span>
 232    <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">()-&gt;</span><span class="identifier">in_avail</span><span class="special">());</span>
 233    <span class="keyword">char</span> <span class="identifier">c</span><span class="special">;</span>
 234    <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>
 235    <span class="special">{</span>
 236       <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>
 237          <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>
 238       <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>
 239    <span class="special">}</span>
 240 <span class="special">}</span>
 241
 242 <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">const</span> <span class="keyword">char</span><span class="special">**</span> <span class="identifier">argv</span><span class="special">)</span>
 243 <span class="special">{</span>
 244    <span class="keyword">try</span><span class="special">{</span>
 245    <span class="identifier">e1</span><span class="special">.</span><span class="identifier">assign</span><span class="special">(</span><span class="identifier">expression_text</span><span class="special">);</span>
 246    <span class="identifier">e2</span><span class="special">.</span><span class="identifier">assign</span><span class="special">(</span><span class="identifier">pre_expression</span><span class="special">);</span>
 247    <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">&lt;</span> <span class="identifier">argc</span><span class="special">;</span> <span class="special">++</span><span class="identifier">i</span><span class="special">)</span>
 248    <span class="special">{</span>
 249       <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"Processing file "</span> <span class="special">&lt;&lt;</span> <span class="identifier">argv</span><span class="special">[</span><span class="identifier">i</span><span class="special">]</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
 250       <span class="identifier">std</span><span class="special">::</span><span class="identifier">ifstream</span> <span class="identifier">fs</span><span class="special">(</span><span class="identifier">argv</span><span class="special">[</span><span class="identifier">i</span><span class="special">]);</span>
 251       <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="identifier">in</span><span class="special">;</span>
 252       <span class="identifier">load_file</span><span class="special">(</span><span class="identifier">in</span><span class="special">,</span> <span class="identifier">fs</span><span class="special">);</span>
 253       <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="identifier">out_name</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">argv</span><span class="special">[</span><span class="identifier">i</span><span class="special">])</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="string">".htm"</span><span class="special">));</span>
 254       <span class="identifier">std</span><span class="special">::</span><span class="identifier">ofstream</span> <span class="identifier">os</span><span class="special">(</span><span class="identifier">out_name</span><span class="special">.</span><span class="identifier">c_str</span><span class="special">());</span>
 255       <span class="identifier">os</span> <span class="special">&lt;&lt;</span> <span class="identifier">header_text</span><span class="special">;</span>
 256       <span class="comment">// strip '&lt;' and '&gt;' first by outputting to a</span>
 257       <span class="comment">// temporary string stream</span>
 258       <span class="identifier">std</span><span class="special">::</span><span class="identifier">ostringstream</span> <span class="identifier">t</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">ios</span><span class="special">::</span><span class="identifier">out</span> <span class="special">|</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios</span><span class="special">::</span><span class="identifier">binary</span><span class="special">);</span>
 259       <span class="identifier">std</span><span class="special">::</span><span class="identifier">ostream_iterator</span><span class="special">&lt;</span><span class="keyword">char</span><span class="special">,</span> <span class="keyword">char</span><span class="special">&gt;</span> <span class="identifier">oi</span><span class="special">(</span><span class="identifier">t</span><span class="special">);</span>
 260       <span class="identifier">boost</span><span class="special">::</span><span class="identifier">regex_replace</span><span class="special">(</span><span class="identifier">oi</span><span class="special">,</span> <span class="identifier">in</span><span class="special">.</span><span class="identifier">begin</span><span class="special">(),</span> <span class="identifier">in</span><span class="special">.</span><span class="identifier">end</span><span class="special">(),</span>
 261       <span class="identifier">e2</span><span class="special">,</span> <span class="identifier">pre_format</span><span class="special">,</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">match_default</span> <span class="special">|</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">format_all</span><span class="special">);</span>
 262       <span class="comment">// then output to final output stream</span>
 263       <span class="comment">// adding syntax highlighting:</span>
 264       <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="identifier">s</span><span class="special">(</span><span class="identifier">t</span><span class="special">.</span><span class="identifier">str</span><span class="special">());</span>
 265       <span class="identifier">std</span><span class="special">::</span><span class="identifier">ostream_iterator</span><span class="special">&lt;</span><span class="keyword">char</span><span class="special">,</span> <span class="keyword">char</span><span class="special">&gt;</span> <span class="identifier">out</span><span class="special">(</span><span class="identifier">os</span><span class="special">);</span>
 266       <span class="identifier">boost</span><span class="special">::</span><span class="identifier">regex_replace</span><span class="special">(</span><span class="identifier">out</span><span class="special">,</span> <span class="identifier">s</span><span class="special">.</span><span class="identifier">begin</span><span class="special">(),</span> <span class="identifier">s</span><span class="special">.</span><span class="identifier">end</span><span class="special">(),</span>
 267       <span class="identifier">e1</span><span class="special">,</span> <span class="identifier">format_string</span><span class="special">,</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">match_default</span> <span class="special">|</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">format_all</span><span class="special">);</span>
 268       <span class="identifier">os</span> <span class="special">&lt;&lt;</span> <span class="identifier">footer_text</span><span class="special">;</span>
 269    <span class="special">}</span>
 270    <span class="special">}</span>
 271    <span class="keyword">catch</span><span class="special">(...)</span>
 272    <span class="special">{</span> <span class="keyword">return</span> <span class="special">-</span><span class="number">1</span><span class="special">;</span> <span class="special">}</span>
 273    <span class="keyword">return</span> <span class="number">0</span><span class="special">;</span>
 274 <span class="special">}</span>
 275
 276 <span class="keyword">extern</span> <span class="keyword">const</span> <span class="keyword">char</span><span class="special">*</span> <span class="identifier">pre_expression</span> <span class="special">=</span> <span class="string">"(&lt;)|(&gt;)|(&amp;)|\\r"</span><span class="special">;</span>
 277 <span class="keyword">extern</span> <span class="keyword">const</span> <span class="keyword">char</span><span class="special">*</span> <span class="identifier">pre_format</span> <span class="special">=</span> <span class="string">"(?1&amp;lt;)(?2&amp;gt;)(?3&amp;amp;)"</span><span class="special">;</span>
 278
 279
 280 <span class="keyword">const</span> <span class="keyword">char</span><span class="special">*</span> <span class="identifier">expression_text</span> <span class="special">=</span>
 281    <span class="comment">// preprocessor directives: index 1</span>
 282    <span class="string">"(^[[:blank:]]*#(?:[^\\\\\\n]|\\\\[^\\n[:punct:][:word:]]*[\\n[:punct:][:word:]])*)|"</span>
 283    <span class="comment">// comment: index 2</span>
 284    <span class="string">"(//[^\\n]*|/\\*.*?\\*/)|"</span>
 285    <span class="comment">// literals: index 3</span>
 286    <span class="string">"\\&lt;([+-]?(?:(?:0x[[:xdigit:]]+)|(?:(?:[[:digit:]]*\\.)?[[:digit:]]+"</span>
 287    <span class="string">"(?:[eE][+-]?[[:digit:]]+)?))u?(?:(?:int(?:8|16|32|64))|L)?)\\&gt;|"</span>
 288    <span class="comment">// string literals: index 4</span>
 289    <span class="string">"('(?:[^\\\\']|\\\\.)*'|\"(?:[^\\\\\"]|\\\\.)*\")|"</span>
 290    <span class="comment">// keywords: index 5</span>
 291    <span class="string">"\\&lt;(__asm|__cdecl|__declspec|__export|__far16|__fastcall|__fortran|__import"</span>
 292    <span class="string">"|__pascal|__rtti|__stdcall|_asm|_cdecl|__except|_export|_far16|_fastcall"</span>
 293    <span class="string">"|__finally|_fortran|_import|_pascal|_stdcall|__thread|__try|asm|auto|bool"</span>
 294    <span class="string">"|break|case|catch|cdecl|char|class|const|const_cast|continue|default|delete"</span>
 295    <span class="string">"|do|double|dynamic_cast|else|enum|explicit|extern|false|float|for|friend|goto"</span>
 296    <span class="string">"|if|inline|int|long|mutable|namespace|new|operator|pascal|private|protected"</span>
 297    <span class="string">"|public|register|reinterpret_cast|return|short|signed|sizeof|static|static_cast"</span>
 298    <span class="string">"|struct|switch|template|this|throw|true|try|typedef|typeid|typename|union|unsigned"</span>
 299    <span class="string">"|using|virtual|void|volatile|wchar_t|while)\\&gt;"</span>
 300    <span class="special">;</span>
 301
 302 <span class="keyword">const</span> <span class="keyword">char</span><span class="special">*</span> <span class="identifier">format_string</span> <span class="special">=</span> <span class="string">"(?1&lt;font color=\"#008040\"&gt;$&amp;&lt;/font&gt;)"</span>
 303                            <span class="string">"(?2&lt;I&gt;&lt;font color=\"#000080\"&gt;$&amp;&lt;/font&gt;&lt;/I&gt;)"</span>
 304                            <span class="string">"(?3&lt;font color=\"#0000A0\"&gt;$&amp;&lt;/font&gt;)"</span>
 305                            <span class="string">"(?4&lt;font color=\"#0000FF\"&gt;$&amp;&lt;/font&gt;)"</span>
 306                            <span class="string">"(?5&lt;B&gt;$&amp;&lt;/B&gt;)"</span><span class="special">;</span>
 307
 308 <span class="keyword">const</span> <span class="keyword">char</span><span class="special">*</span> <span class="identifier">header_text</span> <span class="special">=</span>
 309    <span class="string">"&lt;HTML&gt;\n&lt;HEAD&gt;\n"</span>
 310    <span class="string">"&lt;TITLE&gt;Auto-generated html formatted source&lt;/TITLE&gt;\n"</span>
 311    <span class="string">"&lt;META HTTP-EQUIV=\"Content-Type\" CONTENT=\"text/html; charset=windows-1252\"&gt;\n"</span>
 312    <span class="string">"&lt;/HEAD&gt;\n"</span>
 313    <span class="string">"&lt;BODY LINK=\"#0000ff\" VLINK=\"#800080\" BGCOLOR=\"#ffffff\"&gt;\n"</span>
 314    <span class="string">"&lt;P&gt; &lt;/P&gt;\n&lt;PRE&gt;"</span><span class="special">;</span>
 315
 316 <span class="keyword">const</span> <span class="keyword">char</span><span class="special">*</span> <span class="identifier">footer_text</span> <span class="special">=</span> <span class="string">"&lt;/PRE&gt;\n&lt;/BODY&gt;\n\n"</span><span class="special">;</span>
 317 </pre>
 318 </div>
 319 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 320 <td align="left"></td>
 321 <td align="right"><div class="copyright-footer">Copyright &#169; 1998-2013 John Maddock<p>
 322         Distributed under the Boost Software License, Version 1.0. (See accompanying
 323         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>)
 324       </p>
 325 </div></td>
 326 </tr></table>
 327 <hr>
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