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| <div class="section"> |
| <div class="titlepage"><div><div><h4 class="title"> |
| <a name="spirit.lex.quick_reference.lexer"></a><a class="link" href="lexer.html" title="Supported Regular Expressions">Supported Regular |
| Expressions</a> |
| </h4></div></div></div> |
| <div class="table"> |
| <a name="id1143740"></a><p class="title"><b>Table 11. Regular expressions support</b></p> |
| <div class="table-contents"><table class="table" summary="Regular expressions support"> |
| <colgroup> |
| <col> |
| <col> |
| </colgroup> |
| <thead><tr> |
| <th> |
| <p> |
| Expression |
| </p> |
| </th> |
| <th> |
| <p> |
| Meaning |
| </p> |
| </th> |
| </tr></thead> |
| <tbody> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">x</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| Match any character <code class="computeroutput"><span class="identifier">x</span></code> |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="special">.</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| Match any except newline (or optionally <span class="bold"><strong>any</strong></span> |
| character) |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="string">"..."</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| All characters taken as literals between double quotes, except |
| escape sequences |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="special">[</span><span class="identifier">xyz</span><span class="special">]</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| A character class; in this case matches <code class="computeroutput"><span class="identifier">x</span></code>, |
| <code class="computeroutput"><span class="identifier">y</span></code> or <code class="computeroutput"><span class="identifier">z</span></code> |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="special">[</span><span class="identifier">abj</span><span class="special">-</span><span class="identifier">oZ</span><span class="special">]</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| A character class with a range in it; matches <code class="computeroutput"><span class="identifier">a</span></code>, |
| <code class="computeroutput"><span class="identifier">b</span></code> any letter |
| from <code class="computeroutput"><span class="identifier">j</span></code> through |
| <code class="computeroutput"><span class="identifier">o</span></code> or a <code class="computeroutput"><span class="identifier">Z</span></code> |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="special">[^</span><span class="identifier">A</span><span class="special">-</span><span class="identifier">Z</span><span class="special">]</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| A negated character class i.e. any character but those in the |
| class. In this case, any character except an uppercase letter |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">r</span><span class="special">*</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| Zero or more r's (greedy), where r is any regular expression |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">r</span><span class="special">*?</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| Zero or more r's (abstemious), where r is any regular expression |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">r</span><span class="special">+</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| One or more r's (greedy) |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">r</span><span class="special">+?</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| One or more r's (abstemious) |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">r</span><span class="special">?</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| Zero or one r's (greedy), i.e. optional |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">r</span><span class="special">??</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| Zero or one r's (abstemious), i.e. optional |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">r</span><span class="special">{</span><span class="number">2</span><span class="special">,</span><span class="number">5</span><span class="special">}</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| Anywhere between two and five r's (greedy) |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">r</span><span class="special">{</span><span class="number">2</span><span class="special">,</span><span class="number">5</span><span class="special">}?</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| Anywhere between two and five r's (abstemious) |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">r</span><span class="special">{</span><span class="number">2</span><span class="special">,}</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| Two or more r's (greedy) |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">r</span><span class="special">{</span><span class="number">2</span><span class="special">,}?</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| Two or more r's (abstemious) |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">r</span><span class="special">{</span><span class="number">4</span><span class="special">}</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| Exactly four r's |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="special">{</span><span class="identifier">NAME</span><span class="special">}</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| The macro <code class="computeroutput"><span class="identifier">NAME</span></code> |
| (see below) |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="string">"[xyz]\"foo"</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| The literal string <code class="computeroutput"><span class="special">[</span><span class="identifier">xyz</span><span class="special">]\</span><span class="error">"</span><span class="identifier">foo</span></code> |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="special">\</span><span class="identifier">X</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| If X is <code class="computeroutput"><span class="identifier">a</span></code>, <code class="computeroutput"><span class="identifier">b</span></code>, <code class="computeroutput"><span class="identifier">e</span></code>, |
| <code class="computeroutput"><span class="identifier">n</span></code>, <code class="computeroutput"><span class="identifier">r</span></code>, <code class="computeroutput"><span class="identifier">f</span></code>, |
| <code class="computeroutput"><span class="identifier">t</span></code>, <code class="computeroutput"><span class="identifier">v</span></code> then the ANSI-C interpretation |
| of <code class="computeroutput"><span class="special">\</span><span class="identifier">x</span></code>. |
| Otherwise a literal <code class="computeroutput"><span class="identifier">X</span></code> |
| (used to escape operators such as <code class="computeroutput"><span class="special">*</span></code>) |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="special">\</span><span class="number">0</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| A NUL character (ASCII code 0) |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="special">\</span><span class="number">123</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| The character with octal value 123 |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="special">\</span><span class="identifier">x2a</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| The character with hexadecimal value 2a |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="special">\</span><span class="identifier">cX</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| A named control character <code class="computeroutput"><span class="identifier">X</span></code>. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="special">\</span><span class="identifier">a</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| A shortcut for Alert (bell). |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="special">\</span><span class="identifier">b</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| A shortcut for Backspace |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="special">\</span><span class="identifier">e</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| A shortcut for ESC (escape character <code class="computeroutput"><span class="number">0x1b</span></code>) |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="special">\</span><span class="identifier">n</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| A shortcut for newline |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="special">\</span><span class="identifier">r</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| A shortcut for carriage return |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="special">\</span><span class="identifier">f</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| A shortcut for form feed <code class="computeroutput"><span class="number">0x0c</span></code> |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="special">\</span><span class="identifier">t</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| A shortcut for horizontal tab <code class="computeroutput"><span class="number">0x09</span></code> |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="special">\</span><span class="identifier">v</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| A shortcut for vertical tab <code class="computeroutput"><span class="number">0x0b</span></code> |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="special">\</span><span class="identifier">d</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| A shortcut for <code class="computeroutput"><span class="special">[</span><span class="number">0</span><span class="special">-</span><span class="number">9</span><span class="special">]</span></code> |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="special">\</span><span class="identifier">D</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| A shortcut for <code class="computeroutput"><span class="special">[^</span><span class="number">0</span><span class="special">-</span><span class="number">9</span><span class="special">]</span></code> |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="special">\</span><span class="identifier">s</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| A shortcut for <code class="computeroutput"><span class="special">[\</span><span class="identifier">x20</span><span class="special">\</span><span class="identifier">t</span><span class="special">\</span><span class="identifier">n</span><span class="special">\</span><span class="identifier">r</span><span class="special">\</span><span class="identifier">f</span><span class="special">\</span><span class="identifier">v</span><span class="special">]</span></code> |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="special">\</span><span class="identifier">S</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| A shortcut for <code class="computeroutput"><span class="special">[^\</span><span class="identifier">x20</span><span class="special">\</span><span class="identifier">t</span><span class="special">\</span><span class="identifier">n</span><span class="special">\</span><span class="identifier">r</span><span class="special">\</span><span class="identifier">f</span><span class="special">\</span><span class="identifier">v</span><span class="special">]</span></code> |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="special">\</span><span class="identifier">w</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| A shortcut for <code class="computeroutput"><span class="special">[</span><span class="identifier">a</span><span class="special">-</span><span class="identifier">zA</span><span class="special">-</span><span class="identifier">Z0</span><span class="special">-</span><span class="number">9</span><span class="identifier">_</span><span class="special">]</span></code> |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="special">\</span><span class="identifier">W</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| A shortcut for <code class="computeroutput"><span class="special">[^</span><span class="identifier">a</span><span class="special">-</span><span class="identifier">zA</span><span class="special">-</span><span class="identifier">Z0</span><span class="special">-</span><span class="number">9</span><span class="identifier">_</span><span class="special">]</span></code> |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="special">(</span><span class="identifier">r</span><span class="special">)</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| Match an <code class="computeroutput"><span class="identifier">r</span></code>; parenthesis |
| are used to override precedence (see below) |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="special">(?</span><span class="identifier">r</span><span class="special">-</span><span class="identifier">s</span><span class="special">:</span><span class="identifier">pattern</span><span class="special">)</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| apply option 'r' and omit option 's' while interpreting pattern. |
| Options may be zero or more of the characters 'i' or 's'. 'i' |
| means case-insensitive. '-i' means case-sensitive. 's' alters |
| the meaning of the '.' syntax to match any single character whatsoever. |
| '-s' alters the meaning of '.' to match any character except |
| '<code class="computeroutput"><span class="special">\</span><span class="identifier">n</span></code>'. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">rs</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| The regular expression <code class="computeroutput"><span class="identifier">r</span></code> |
| followed by the regular expression <code class="computeroutput"><span class="identifier">s</span></code> |
| (a sequence) |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">r</span><span class="special">|</span><span class="identifier">s</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| Either an <code class="computeroutput"><span class="identifier">r</span></code> or |
| and <code class="computeroutput"><span class="identifier">s</span></code> |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="special">^</span><span class="identifier">r</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| An <code class="computeroutput"><span class="identifier">r</span></code> but only |
| at the beginning of a line (i.e. when just starting to scan, |
| or right after a newline has been scanned) |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">r</span></code>$ |
| </p> |
| </td> |
| <td> |
| <p> |
| An <code class="computeroutput"><span class="identifier">r</span></code> but only |
| at the end of a line (i.e. just before a newline) |
| </p> |
| </td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| <br class="table-break"><div class="note"><table border="0" summary="Note"> |
| <tr> |
| <td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../images/note.png"></td> |
| <th align="left">Note</th> |
| </tr> |
| <tr><td align="left" valign="top"><p> |
| POSIX character classes are not currently supported, due to performance |
| issues when creating them in wide character mode. |
| </p></td></tr> |
| </table></div> |
| <div class="tip"><table border="0" summary="Tip"> |
| <tr> |
| <td rowspan="2" align="center" valign="top" width="25"><img alt="[Tip]" src="../../../images/tip.png"></td> |
| <th align="left">Tip</th> |
| </tr> |
| <tr><td align="left" valign="top"> |
| <p> |
| If you want to build tokens for syntaxes that recognize items like quotes |
| (<code class="computeroutput"><span class="string">"'"</span></code>, <code class="computeroutput"><span class="char">'"'</span></code>) and backslash (<code class="computeroutput"><span class="special">\</span></code>), |
| here is example syntax to get you started. The lesson here really is |
| to remember that both c++, as well as regular expressions require escaping |
| with <code class="computeroutput"><span class="special">\</span></code> for some constructs, |
| which can cascade. |
| </p> |
| <pre class="programlisting"><span class="identifier">quote1</span> <span class="special">=</span> <span class="string">"'"</span><span class="special">;</span> <span class="comment">// match single "'" |
| </span><span class="identifier">quote2</span> <span class="special">=</span> <span class="string">"\\\""</span><span class="special">;</span> <span class="comment">// match single '"' |
| </span><span class="identifier">literal_quote1</span> <span class="special">=</span> <span class="string">"\\'"</span><span class="special">;</span> <span class="comment">// match backslash followed by single "'" |
| </span><span class="identifier">literal_quote2</span> <span class="special">=</span> <span class="string">"\\\\\\\""</span><span class="special">;</span> <span class="comment">// match backslash followed by single '"' |
| </span><span class="identifier">literal_backslash</span> <span class="special">=</span> <span class="string">"\\\\\\\\"</span><span class="special">;</span> <span class="comment">// match two backslashes |
| </span></pre> |
| <p> |
| </p> |
| </td></tr> |
| </table></div> |
| <a name="spirit.lex.quick_reference.lexer.regular_expression_precedence"></a><h6> |
| <a name="id1145875"></a> |
| <a class="link" href="lexer.html#spirit.lex.quick_reference.lexer.regular_expression_precedence">Regular |
| Expression Precedence</a> |
| </h6> |
| <div class="itemizedlist"><ul class="itemizedlist" type="disc"> |
| <li class="listitem"> |
| <code class="computeroutput"><span class="identifier">rs</span></code> has highest precedence |
| </li> |
| <li class="listitem"> |
| <code class="computeroutput"><span class="identifier">r</span><span class="special">*</span></code> |
| has next highest (<code class="computeroutput"><span class="special">+</span></code>, |
| <code class="computeroutput"><span class="special">?</span></code>, <code class="computeroutput"><span class="special">{</span><span class="identifier">n</span><span class="special">,</span><span class="identifier">m</span><span class="special">}</span></code> |
| have the same precedence as <code class="computeroutput"><span class="special">*</span></code>) |
| </li> |
| <li class="listitem"> |
| <code class="computeroutput"><span class="identifier">r</span><span class="special">|</span><span class="identifier">s</span></code> has the lowest precedence |
| </li> |
| </ul></div> |
| <a name="spirit.lex.quick_reference.lexer.macros"></a><h6> |
| <a name="id1145991"></a> |
| <a class="link" href="lexer.html#spirit.lex.quick_reference.lexer.macros">Macros</a> |
| </h6> |
| <p> |
| Regular expressions can be given a name and referred to in rules using |
| the syntax <code class="computeroutput"><span class="special">{</span><span class="identifier">NAME</span><span class="special">}</span></code> where <code class="computeroutput"><span class="identifier">NAME</span></code> |
| is the name you have given to the macro. A macro name can be at most 30 |
| characters long and must start with a <code class="computeroutput"><span class="identifier">_</span></code> |
| or a letter. Subsequent characters can be <code class="computeroutput"><span class="identifier">_</span></code>, |
| <code class="computeroutput"><span class="special">-</span></code>, a letter or a decimal digit. |
| </p> |
| </div> |
| <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> |
| <td align="left"></td> |
| <td align="right"><div class="copyright-footer">Copyright © 2001-2010 Joel de Guzman, Hartmut Kaiser<p> |
| Distributed under the Boost Software License, Version 1.0. (See accompanying |
| 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>) |
| </p> |
| </div></td> |
| </tr></table> |
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