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| <div class="titlepage"><div><div><h4 class="title"> |
| <a name="boost_regex.ref.syntax_option_type.syntax_option_type_basic"></a><a class="link" href="syntax_option_type_basic.html" title="Options for POSIX Basic Regular Expressions"> |
| Options for POSIX Basic Regular Expressions</a> |
| </h4></div></div></div> |
| <p> |
| Exactly one of the following must always be set for POSIX basic regular |
| expressions: |
| </p> |
| <div class="informaltable"><table class="table"> |
| <colgroup> |
| <col> |
| <col> |
| <col> |
| </colgroup> |
| <thead><tr> |
| <th> |
| <p> |
| Element |
| </p> |
| </th> |
| <th> |
| <p> |
| Standardized |
| </p> |
| </th> |
| <th> |
| <p> |
| Effect When Set |
| </p> |
| </th> |
| </tr></thead> |
| <tbody> |
| <tr> |
| <td> |
| <p> |
| basic |
| </p> |
| </td> |
| <td> |
| <p> |
| Yes |
| </p> |
| </td> |
| <td> |
| <p> |
| Specifies that the grammar recognized by the regular expression |
| engine is the same as that used by <a class="link" href="../../syntax/basic_syntax.html" title="POSIX Basic Regular Expression Syntax">POSIX |
| basic regular expressions</a> in IEEE Std 1003.1-2001, Portable |
| Operating System Interface (POSIX ), Base Definitions and Headers, |
| Section 9, Regular Expressions (FWD.1). |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| sed |
| </p> |
| </td> |
| <td> |
| <p> |
| No |
| </p> |
| </td> |
| <td> |
| <p> |
| As Above. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| grep |
| </p> |
| </td> |
| <td> |
| <p> |
| Yes |
| </p> |
| </td> |
| <td> |
| <p> |
| Specifies that the grammar recognized by the regular expression |
| engine is the same as that used by POSIX utility <code class="computeroutput"><span class="identifier">grep</span></code> in IEEE Std 1003.1-2001, |
| Portable Operating System Interface (POSIX ), Shells and Utilities, |
| Section 4, Utilit\ies, grep (FWD.1). |
| </p> |
| <p> |
| That is to say, the same as <a class="link" href="../../syntax/basic_syntax.html" title="POSIX Basic Regular Expression Syntax">POSIX |
| basic syntax</a>, but with the newline character acting as |
| an alternation character; the expression is treated as a newline |
| separated list of alternatives. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| emacs |
| </p> |
| </td> |
| <td> |
| <p> |
| No |
| </p> |
| </td> |
| <td> |
| <p> |
| Specifies that the grammar recognised is the superset of the |
| <a class="link" href="../../syntax/basic_syntax.html" title="POSIX Basic Regular Expression Syntax">POSIX-Basic syntax</a> |
| used by the emacs program. |
| </p> |
| </td> |
| </tr> |
| </tbody> |
| </table></div> |
| <p> |
| The following options may also be set when using POSIX basic regular expressions: |
| </p> |
| <div class="informaltable"><table class="table"> |
| <colgroup> |
| <col> |
| <col> |
| <col> |
| </colgroup> |
| <thead><tr> |
| <th> |
| <p> |
| Element |
| </p> |
| </th> |
| <th> |
| <p> |
| Standardized |
| </p> |
| </th> |
| <th> |
| <p> |
| Effect when set |
| </p> |
| </th> |
| </tr></thead> |
| <tbody> |
| <tr> |
| <td> |
| <p> |
| icase |
| </p> |
| </td> |
| <td> |
| <p> |
| Yes |
| </p> |
| </td> |
| <td> |
| <p> |
| Specifies that matching of regular expressions against a character |
| container sequence shall be performed without regard to case. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| nosubs |
| </p> |
| </td> |
| <td> |
| <p> |
| Yes |
| </p> |
| </td> |
| <td> |
| <p> |
| Specifies that when a regular expression is matched against a |
| character container sequence, then no sub-expression matches |
| are to be stored in the supplied <a class="link" href="../match_results.html" title="match_results"><code class="computeroutput"><span class="identifier">match_results</span></code></a> structure. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| optimize |
| </p> |
| </td> |
| <td> |
| <p> |
| Yes |
| </p> |
| </td> |
| <td> |
| <p> |
| Specifies that the regular expression engine should pay more |
| attention to the speed with which regular expressions are matched, |
| and less to the speed with which regular expression objects are |
| constructed. Otherwise it has no detectable effect on the program |
| output. This currently has no effect for Boost.Regex. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| collate |
| </p> |
| </td> |
| <td> |
| <p> |
| Yes |
| </p> |
| </td> |
| <td> |
| <p> |
| Specifies that character ranges of the form <code class="computeroutput"><span class="special">[</span><span class="identifier">a</span><span class="special">-</span><span class="identifier">b</span><span class="special">]</span></code> |
| should be locale sensitive. This bit is on by default for <a class="link" href="../../syntax/basic_syntax.html" title="POSIX Basic Regular Expression Syntax">POSIX-Basic regular |
| expressions</a>, but can be unset to force ranges to be compared |
| by code point only. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| newline_alt |
| </p> |
| </td> |
| <td> |
| <p> |
| No |
| </p> |
| </td> |
| <td> |
| <p> |
| Specifies that the \n character has the same effect as the alternation |
| operator |. Allows newline separated lists to be used as a list |
| of alternatives. This bit is already set, if you use the <code class="computeroutput"><span class="identifier">grep</span></code> option. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| no_char_classes |
| </p> |
| </td> |
| <td> |
| <p> |
| No |
| </p> |
| </td> |
| <td> |
| <p> |
| When set then character classes such as <code class="computeroutput"><span class="special">[[:</span><span class="identifier">alnum</span><span class="special">:]]</span></code> |
| are not allowed. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| no_escape_in_lists |
| </p> |
| </td> |
| <td> |
| <p> |
| No |
| </p> |
| </td> |
| <td> |
| <p> |
| When set this makes the escape character ordinary inside lists, |
| so that <code class="computeroutput"><span class="special">[\</span><span class="identifier">b</span><span class="special">]</span></code> would match either '\' or 'b'. |
| This bit is on by default for <a class="link" href="../../syntax/basic_syntax.html" title="POSIX Basic Regular Expression Syntax">POSIX-basic |
| regular expressions</a>, but can be unset to force escapes |
| to be recognised inside lists. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| no_intervals |
| </p> |
| </td> |
| <td> |
| <p> |
| No |
| </p> |
| </td> |
| <td> |
| <p> |
| When set then bounded repeats such as a{2,3} are not permitted. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| bk_plus_qm |
| </p> |
| </td> |
| <td> |
| <p> |
| No |
| </p> |
| </td> |
| <td> |
| <p> |
| When set then <code class="computeroutput"><span class="special">\?</span></code> |
| acts as a zero-or-one repeat operator, and <code class="computeroutput"><span class="special">\+</span></code> |
| acts as a one-or-more repeat operator. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| bk_vbar |
| </p> |
| </td> |
| <td> |
| <p> |
| No |
| </p> |
| </td> |
| <td> |
| <p> |
| When set then <code class="computeroutput"><span class="special">\|</span></code> |
| acts as the alternation operator. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| no_except |
| </p> |
| </td> |
| <td> |
| <p> |
| No |
| </p> |
| </td> |
| <td> |
| <p> |
| Prevents <a class="link" href="../basic_regex.html" title="basic_regex"><code class="computeroutput"><span class="identifier">basic_regex</span></code></a> from throwing |
| an exception when an invalid expression is encountered. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| save_subexpression_location |
| </p> |
| </td> |
| <td> |
| <p> |
| No |
| </p> |
| </td> |
| <td> |
| <p> |
| When set then the locations of individual sub-expressions within |
| the <span class="emphasis"><em>original regular expression string</em></span> can |
| be accessed via the <a class="link" href="../basic_regex.html#boost_regex.basic_regex.subexpression"><code class="computeroutput"><span class="identifier">subexpression</span><span class="special">()</span></code></a> |
| member function of <code class="computeroutput"><span class="identifier">basic_regex</span></code>. |
| </p> |
| </td> |
| </tr> |
| </tbody> |
| </table></div> |
| </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 © 1998 -2010 John Maddock<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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