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| <div class="section" lang="en"> |
| <div class="titlepage"><div><div><h3 class="title"> |
| <a name="boost_regex.background_information.standards"></a><a class="link" href="standards.html" title="Standards Conformance"> Standards |
| Conformance</a> |
| </h3></div></div></div> |
| <a name="boost_regex.background_information.standards.c__"></a><h5> |
| <a name="id1067808"></a> |
| <a class="link" href="standards.html#boost_regex.background_information.standards.c__">C++</a> |
| </h5> |
| <p> |
| Boost.Regex is intended to conform to the <a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1836.pdf" target="_top">Technical |
| Report on C++ Library Extensions</a>. |
| </p> |
| <a name="boost_regex.background_information.standards.ecmascript___javascript"></a><h5> |
| <a name="id1067830"></a> |
| <a class="link" href="standards.html#boost_regex.background_information.standards.ecmascript___javascript">ECMAScript |
| / JavaScript</a> |
| </h5> |
| <p> |
| All of the ECMAScript regular expression syntax features are supported, except |
| that: |
| </p> |
| <p> |
| The escape sequence \u matches any upper case character (the same as [[:upper:]]) |
| rather than a Unicode escape sequence; use \x{DDDD} for Unicode escape sequences. |
| </p> |
| <a name="boost_regex.background_information.standards.perl"></a><h5> |
| <a name="id1067850"></a> |
| <a class="link" href="standards.html#boost_regex.background_information.standards.perl">Perl</a> |
| </h5> |
| <p> |
| Almost all Perl features are supported, except for: |
| </p> |
| <p> |
| (?{code}) Not implementable in a compiled strongly typed language. |
| </p> |
| <p> |
| (??{code}) Not implementable in a compiled strongly typed language. |
| </p> |
| <p> |
| (*VERB) The <a href="http://perldoc.perl.org/perlre.html#Special-Backtracking-Control-Verbs" target="_top">backtracking |
| control verbs</a> are not recognised or implemented at this time. |
| </p> |
| <p> |
| In addition the following features behave slightly differently from Perl: |
| </p> |
| <p> |
| ^ $ \Z These recognise any line termination sequence, and not just \n: see |
| the Unicode requirements below. |
| </p> |
| <a name="boost_regex.background_information.standards.posix"></a><h5> |
| <a name="id1067890"></a> |
| <a class="link" href="standards.html#boost_regex.background_information.standards.posix">POSIX</a> |
| </h5> |
| <p> |
| All the POSIX basic and extended regular expression features are supported, |
| except that: |
| </p> |
| <p> |
| No character collating names are recognized except those specified in the |
| POSIX standard for the C locale, unless they are explicitly registered with |
| the traits class. |
| </p> |
| <p> |
| Character equivalence classes ( [[=a=]] etc) are probably buggy except on |
| Win32. Implementing this feature requires knowledge of the format of the |
| string sort keys produced by the system; if you need this, and the default |
| implementation doesn't work on your platform, then you will need to supply |
| a custom traits class. |
| </p> |
| <a name="boost_regex.background_information.standards.unicode"></a><h5> |
| <a name="id1067914"></a> |
| <a class="link" href="standards.html#boost_regex.background_information.standards.unicode">Unicode</a> |
| </h5> |
| <p> |
| The following comments refer to <a href="http://unicode.org/reports/tr18/" target="_top">Unicode |
| Technical Standard #18: Unicode Regular Expressions version 11</a>. |
| </p> |
| <div class="informaltable"><table class="table"> |
| <colgroup> |
| <col> |
| <col> |
| <col> |
| </colgroup> |
| <thead><tr> |
| <th> |
| <p> |
| Item |
| </p> |
| </th> |
| <th> |
| <p> |
| Feature |
| </p> |
| </th> |
| <th> |
| <p> |
| Support |
| </p> |
| </th> |
| </tr></thead> |
| <tbody> |
| <tr> |
| <td> |
| <p> |
| 1.1 |
| </p> |
| </td> |
| <td> |
| <p> |
| Hex Notation |
| </p> |
| </td> |
| <td> |
| <p> |
| Yes: use \x{DDDD} to refer to code point UDDDD. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| 1.2 |
| </p> |
| </td> |
| <td> |
| <p> |
| Character Properties |
| </p> |
| </td> |
| <td> |
| <p> |
| All the names listed under the General Category Property are supported. |
| Script names and Other Names are not currently supported. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| 1.3 |
| </p> |
| </td> |
| <td> |
| <p> |
| Subtraction and Intersection |
| </p> |
| </td> |
| <td> |
| <p> |
| Indirectly support by forward-lookahead: |
| </p> |
| <p> |
| <code class="computeroutput"><span class="special">(?=[[:</span><span class="identifier">X</span><span class="special">:]])[[:</span><span class="identifier">Y</span><span class="special">:]]</span></code> |
| </p> |
| <p> |
| Gives the intersection of character properties X and Y. |
| </p> |
| <p> |
| <code class="computeroutput"><span class="special">(?![[:</span><span class="identifier">X</span><span class="special">:]])[[:</span><span class="identifier">Y</span><span class="special">:]]</span></code> |
| </p> |
| <p> |
| Gives everything in Y that is not in X (subtraction). |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| 1.4 |
| </p> |
| </td> |
| <td> |
| <p> |
| Simple Word Boundaries |
| </p> |
| </td> |
| <td> |
| <p> |
| Conforming: non-spacing marks are included in the set of word characters. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| 1.5 |
| </p> |
| </td> |
| <td> |
| <p> |
| Caseless Matching |
| </p> |
| </td> |
| <td> |
| <p> |
| Supported, note that at this level, case transformations are 1:1, |
| many to many case folding operations are not supported (for example |
| "ß" to "SS"). |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| 1.6 |
| </p> |
| </td> |
| <td> |
| <p> |
| Line Boundaries |
| </p> |
| </td> |
| <td> |
| <p> |
| Supported, except that "." matches only one character |
| of "\r\n". Other than that word boundaries match correctly; |
| including not matching in the middle of a "\r\n" sequence. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| 1.7 |
| </p> |
| </td> |
| <td> |
| <p> |
| Code Points |
| </p> |
| </td> |
| <td> |
| <p> |
| Supported: provided you use the u32* algorithms, then UTF-8, UTF-16 |
| and UTF-32 are all treated as sequences of 32-bit code points. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| 2.1 |
| </p> |
| </td> |
| <td> |
| <p> |
| Canonical Equivalence |
| </p> |
| </td> |
| <td> |
| <p> |
| Not supported: it is up to the user of the library to convert all |
| text into the same canonical form as the regular expression. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| 2.2 |
| </p> |
| </td> |
| <td> |
| <p> |
| Default Grapheme Clusters |
| </p> |
| </td> |
| <td> |
| <p> |
| Not supported. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| 2.3Default Word Boundaries |
| </p> |
| </td> |
| <td> |
| <p> |
| Not supported. |
| </p> |
| </td> |
| <td class="auto-generated"> </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| 2.4 |
| </p> |
| </td> |
| <td> |
| <p> |
| Default Loose Matches |
| </p> |
| </td> |
| <td> |
| <p> |
| Not Supported. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| 2.5 |
| </p> |
| </td> |
| <td> |
| <p> |
| Named Properties |
| </p> |
| </td> |
| <td> |
| <p> |
| Supported: the expression "[[:name:]]" or \N{name} matches |
| the named character "name". |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| 2.6 |
| </p> |
| </td> |
| <td> |
| <p> |
| Wildcard properties |
| </p> |
| </td> |
| <td> |
| <p> |
| Not Supported. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| 3.1 |
| </p> |
| </td> |
| <td> |
| <p> |
| Tailored Punctuation. |
| </p> |
| </td> |
| <td> |
| <p> |
| Not Supported. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| 3.2 |
| </p> |
| </td> |
| <td> |
| <p> |
| Tailored Grapheme Clusters |
| </p> |
| </td> |
| <td> |
| <p> |
| Not Supported. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| 3.3 |
| </p> |
| </td> |
| <td> |
| <p> |
| Tailored Word Boundaries. |
| </p> |
| </td> |
| <td> |
| <p> |
| Not Supported. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| 3.4 |
| </p> |
| </td> |
| <td> |
| <p> |
| Tailored Loose Matches |
| </p> |
| </td> |
| <td> |
| <p> |
| Partial support: [[=c=]] matches characters with the same primary |
| equivalence class as "c". |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| 3.5 |
| </p> |
| </td> |
| <td> |
| <p> |
| Tailored Ranges |
| </p> |
| </td> |
| <td> |
| <p> |
| Supported: [a-b] matches any character that collates in the range |
| a to b, when the expression is constructed with the collate flag |
| set. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| 3.6 |
| </p> |
| </td> |
| <td> |
| <p> |
| Context Matches |
| </p> |
| </td> |
| <td> |
| <p> |
| Not Supported. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| 3.7 |
| </p> |
| </td> |
| <td> |
| <p> |
| Incremental Matches |
| </p> |
| </td> |
| <td> |
| <p> |
| Supported: pass the flag <code class="computeroutput"><span class="identifier">match_partial</span></code> |
| to the regex algorithms. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| 3.8 |
| </p> |
| </td> |
| <td> |
| <p> |
| Unicode Set Sharing |
| </p> |
| </td> |
| <td> |
| <p> |
| Not Supported. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| 3.9 |
| </p> |
| </td> |
| <td> |
| <p> |
| Possible Match Sets |
| </p> |
| </td> |
| <td> |
| <p> |
| Not supported, however this information is used internally to optimise |
| the matching of regular expressions, and return quickly if no match |
| is possible. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| 3.10 |
| </p> |
| </td> |
| <td> |
| <p> |
| Folded Matching |
| </p> |
| </td> |
| <td> |
| <p> |
| Partial Support: It is possible to achieve a similar effect by |
| using a custom regular expression traits class. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| 3.11 |
| </p> |
| </td> |
| <td> |
| <p> |
| Custom Submatch Evaluation |
| </p> |
| </td> |
| <td> |
| <p> |
| Not Supported. |
| </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> |
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