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Empty expressions, and empty alternatives are now

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allowed when using the Perl regular expression syntax.  This change has
been added for Perl compatibility, when the new [syntax_option_type]
['no_empty_expressions] is set then the old behaviour is preserved and
empty expressions are prohibited.  This is issue
[@https://svn.boost.org/trac/boost/ticket/1081 #1081].

Fixes #1081.

[SVN r50374]
This commit is contained in:
John Maddock
2008-12-23 19:06:04 +00:00
parent b4152cd74d
commit e4b31ea37f
25 changed files with 147 additions and 81 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
doc/history.qbk
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@ -10,6 +10,12 @@
[h4 Boost 1.38] [h4 Boost 1.38]
* [*Breaking change]: empty expressions, and empty alternatives are now
allowed when using the Perl regular expression syntax. This change has
been added for Perl compatibility, when the new [syntax_option_type]
['no_empty_expressions] is set then the old behaviour is preserved and
empty expressions are prohibited. This is issue
[@https://svn.boost.org/trac/boost/ticket/1081 #1081].
* Added support for Perl style ${n} expressions in format strings * Added support for Perl style ${n} expressions in format strings
(issue [@https://svn.boost.org/trac/boost/ticket/2556 #2556]). (issue [@https://svn.boost.org/trac/boost/ticket/2556 #2556]).
* Added support for accessing the location of sub-expressions within the * Added support for accessing the location of sub-expressions within the

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@ -28,7 +28,7 @@
Example Programs</a> Example Programs</a>
</h3></div></div></div> </h3></div></div></div>
<a name="boost_regex.background_information.examples.test_programs"></a><h5> <a name="boost_regex.background_information.examples.test_programs"></a><h5>
<a name="id685514"></a> <a name="id685550"></a>
<a class="link" href="examples.html#boost_regex.background_information.examples.test_programs">Test <a class="link" href="examples.html#boost_regex.background_information.examples.test_programs">Test
Programs</a> Programs</a>
</h5> </h5>
@ -107,7 +107,7 @@
Files: <a href="../../../../test/captures/captures_test.cpp" target="_top">captures_test.cpp</a>. Files: <a href="../../../../test/captures/captures_test.cpp" target="_top">captures_test.cpp</a>.
</p> </p>
<a name="boost_regex.background_information.examples.example_programs"></a><h5> <a name="boost_regex.background_information.examples.example_programs"></a><h5>
<a name="id685902"></a> <a name="id685938"></a>
<a class="link" href="examples.html#boost_regex.background_information.examples.example_programs">Example <a class="link" href="examples.html#boost_regex.background_information.examples.example_programs">Example
programs</a> programs</a>
</h5> </h5>
@ -133,7 +133,7 @@
Files: <a href="../../../../example/timer/regex_timer.cpp" target="_top">regex_timer.cpp</a>. Files: <a href="../../../../example/timer/regex_timer.cpp" target="_top">regex_timer.cpp</a>.
</p> </p>
<a name="boost_regex.background_information.examples.code_snippets"></a><h5> <a name="boost_regex.background_information.examples.code_snippets"></a><h5>
<a name="id685983"></a> <a name="id686019"></a>
<a class="link" href="examples.html#boost_regex.background_information.examples.code_snippets">Code <a class="link" href="examples.html#boost_regex.background_information.examples.code_snippets">Code
snippets</a> snippets</a>
</h5> </h5>

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@ -26,11 +26,18 @@
<a name="boost_regex.background_information.history"></a><a class="link" href="history.html" title="History"> History</a> <a name="boost_regex.background_information.history"></a><a class="link" href="history.html" title="History"> History</a>
</h3></div></div></div> </h3></div></div></div>
<a name="boost_regex.background_information.history.boost_1_38"></a><h5> <a name="boost_regex.background_information.history.boost_1_38"></a><h5>
<a name="id688124"></a> <a name="id688173"></a>
<a class="link" href="history.html#boost_regex.background_information.history.boost_1_38">Boost <a class="link" href="history.html#boost_regex.background_information.history.boost_1_38">Boost
1.38</a> 1.38</a>
</h5> </h5>
<div class="itemizedlist"><ul type="disc"> <div class="itemizedlist"><ul type="disc">
<li>
<span class="bold"><strong>Breaking change</strong></span>: empty expressions, and
empty alternatives are now allowed when using the Perl regular expression
syntax. This change has been added for Perl compatibility, when the new
<a class="link" href="../ref/syntax_option_type.html" title="syntax_option_type"><code class="computeroutput"><span class="identifier">syntax_option_type</span></code></a><span class="emphasis"><em>no_empty_expressions</em></span> is set then the old behaviour
is preserved and empty expressions are prohibited.
</li>
<li> <li>
Added support for Perl style ${n} expressions in format strings (issue Added support for Perl style ${n} expressions in format strings (issue
<a href="https://svn.boost.org/trac/boost/ticket/2556" target="_top">#2556</a>). <a href="https://svn.boost.org/trac/boost/ticket/2556" target="_top">#2556</a>).
@ -40,12 +47,13 @@
regular expression string (issue <a href="https://svn.boost.org/trac/boost/ticket/2269" target="_top">#2269</a>). regular expression string (issue <a href="https://svn.boost.org/trac/boost/ticket/2269" target="_top">#2269</a>).
</li> </li>
<li> <li>
Fixed compiler compatibility issues <a href="https://svn.boost.org/trac/boost/ticket/2244" target="_top">#2244</a> Fixed compiler compatibility issues <a href="https://svn.boost.org/trac/boost/ticket/2244" target="_top">#2244</a>,
<a href="https://svn.boost.org/trac/boost/ticket/2514" target="_top">#2514</a>,
and <a href="https://svn.boost.org/trac/boost/ticket/2244" target="_top">#2458</a>. and <a href="https://svn.boost.org/trac/boost/ticket/2244" target="_top">#2458</a>.
</li> </li>
</ul></div> </ul></div>
<a name="boost_regex.background_information.history.boost_1_34"></a><h5> <a name="boost_regex.background_information.history.boost_1_34"></a><h5>
<a name="id688198"></a> <a name="id688292"></a>
<a class="link" href="history.html#boost_regex.background_information.history.boost_1_34">Boost <a class="link" href="history.html#boost_regex.background_information.history.boost_1_34">Boost
1.34</a> 1.34</a>
</h5> </h5>
@ -68,7 +76,7 @@
</li> </li>
</ul></div> </ul></div>
<a name="boost_regex.background_information.history.boost_1_33_1"></a><h5> <a name="boost_regex.background_information.history.boost_1_33_1"></a><h5>
<a name="id688249"></a> <a name="id688343"></a>
<a class="link" href="history.html#boost_regex.background_information.history.boost_1_33_1">Boost <a class="link" href="history.html#boost_regex.background_information.history.boost_1_33_1">Boost
1.33.1</a> 1.33.1</a>
</h5> </h5>
@ -138,7 +146,7 @@
</li> </li>
</ul></div> </ul></div>
<a name="boost_regex.background_information.history.boost_1_33_0"></a><h5> <a name="boost_regex.background_information.history.boost_1_33_0"></a><h5>
<a name="id688378"></a> <a name="id688472"></a>
<a class="link" href="history.html#boost_regex.background_information.history.boost_1_33_0">Boost <a class="link" href="history.html#boost_regex.background_information.history.boost_1_33_0">Boost
1.33.0</a> 1.33.0</a>
</h5> </h5>
@ -193,7 +201,7 @@
</li> </li>
</ul></div> </ul></div>
<a name="boost_regex.background_information.history.boost_1_32_1"></a><h5> <a name="boost_regex.background_information.history.boost_1_32_1"></a><h5>
<a name="id688484"></a> <a name="id688569"></a>
<a class="link" href="history.html#boost_regex.background_information.history.boost_1_32_1">Boost <a class="link" href="history.html#boost_regex.background_information.history.boost_1_32_1">Boost
1.32.1</a> 1.32.1</a>
</h5> </h5>
@ -201,7 +209,7 @@
Fixed bug in partial matches of bounded repeats of '.'. Fixed bug in partial matches of bounded repeats of '.'.
</li></ul></div> </li></ul></div>
<a name="boost_regex.background_information.history.boost_1_31_0"></a><h5> <a name="boost_regex.background_information.history.boost_1_31_0"></a><h5>
<a name="id688518"></a> <a name="id688603"></a>
<a class="link" href="history.html#boost_regex.background_information.history.boost_1_31_0">Boost <a class="link" href="history.html#boost_regex.background_information.history.boost_1_31_0">Boost
1.31.0</a> 1.31.0</a>
</h5> </h5>

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@ -58,7 +58,7 @@
There are three separate localization mechanisms supported by Boost.Regex: There are three separate localization mechanisms supported by Boost.Regex:
</p> </p>
<a name="boost_regex.background_information.locale.win32_localization_model_"></a><h5> <a name="boost_regex.background_information.locale.win32_localization_model_"></a><h5>
<a name="id682026"></a> <a name="id682058"></a>
<a class="link" href="locale.html#boost_regex.background_information.locale.win32_localization_model_">Win32 <a class="link" href="locale.html#boost_regex.background_information.locale.win32_localization_model_">Win32
localization model.</a> localization model.</a>
</h5> </h5>
@ -90,7 +90,7 @@
are treated as "unknown" graphic characters. are treated as "unknown" graphic characters.
</p> </p>
<a name="boost_regex.background_information.locale.c_localization_model_"></a><h5> <a name="boost_regex.background_information.locale.c_localization_model_"></a><h5>
<a name="id682260"></a> <a name="id682296"></a>
<a class="link" href="locale.html#boost_regex.background_information.locale.c_localization_model_">C <a class="link" href="locale.html#boost_regex.background_information.locale.c_localization_model_">C
localization model.</a> localization model.</a>
</h5> </h5>
@ -114,7 +114,7 @@
libraries including version 1 of this library. libraries including version 1 of this library.
</p> </p>
<a name="boost_regex.background_information.locale.c___localization_model_"></a><h5> <a name="boost_regex.background_information.locale.c___localization_model_"></a><h5>
<a name="id682372"></a> <a name="id682409"></a>
<a class="link" href="locale.html#boost_regex.background_information.locale.c___localization_model_">C++ <a class="link" href="locale.html#boost_regex.background_information.locale.c___localization_model_">C++
localization model.</a> localization model.</a>
</h5> </h5>
@ -151,7 +151,7 @@
in your code. The best way to ensure this is to add the #define to <code class="computeroutput"><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">user</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>. in your code. The best way to ensure this is to add the #define to <code class="computeroutput"><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">user</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>.
</p> </p>
<a name="boost_regex.background_information.locale.providing_a_message_catalogue"></a><h5> <a name="boost_regex.background_information.locale.providing_a_message_catalogue"></a><h5>
<a name="id682832"></a> <a name="id682868"></a>
<a class="link" href="locale.html#boost_regex.background_information.locale.providing_a_message_catalogue">Providing <a class="link" href="locale.html#boost_regex.background_information.locale.providing_a_message_catalogue">Providing
a message catalogue</a> a message catalogue</a>
</h5> </h5>

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@ -28,7 +28,7 @@
Conformance</a> Conformance</a>
</h3></div></div></div> </h3></div></div></div>
<a name="boost_regex.background_information.standards.c__"></a><h5> <a name="boost_regex.background_information.standards.c__"></a><h5>
<a name="id686962"></a> <a name="id686998"></a>
<a class="link" href="standards.html#boost_regex.background_information.standards.c__">C++</a> <a class="link" href="standards.html#boost_regex.background_information.standards.c__">C++</a>
</h5> </h5>
<p> <p>
@ -36,7 +36,7 @@
Report on C++ Library Extensions</a>. Report on C++ Library Extensions</a>.
</p> </p>
<a name="boost_regex.background_information.standards.ecmascript___javascript"></a><h5> <a name="boost_regex.background_information.standards.ecmascript___javascript"></a><h5>
<a name="id687001"></a> <a name="id687036"></a>
<a class="link" href="standards.html#boost_regex.background_information.standards.ecmascript___javascript">ECMAScript <a class="link" href="standards.html#boost_regex.background_information.standards.ecmascript___javascript">ECMAScript
/ JavaScript</a> / JavaScript</a>
</h5> </h5>
@ -49,7 +49,7 @@
rather than a Unicode escape sequence; use \x{DDDD} for Unicode escape sequences. rather than a Unicode escape sequence; use \x{DDDD} for Unicode escape sequences.
</p> </p>
<a name="boost_regex.background_information.standards.perl"></a><h5> <a name="boost_regex.background_information.standards.perl"></a><h5>
<a name="id687040"></a> <a name="id687075"></a>
<a class="link" href="standards.html#boost_regex.background_information.standards.perl">Perl</a> <a class="link" href="standards.html#boost_regex.background_information.standards.perl">Perl</a>
</h5> </h5>
<p> <p>
@ -62,7 +62,7 @@
(??{code}) Not implementable in a compiled strongly typed language. (??{code}) Not implementable in a compiled strongly typed language.
</p> </p>
<a name="boost_regex.background_information.standards.posix"></a><h5> <a name="boost_regex.background_information.standards.posix"></a><h5>
<a name="id687078"></a> <a name="id687114"></a>
<a class="link" href="standards.html#boost_regex.background_information.standards.posix">POSIX</a> <a class="link" href="standards.html#boost_regex.background_information.standards.posix">POSIX</a>
</h5> </h5>
<p> <p>
@ -82,7 +82,7 @@
a custom traits class. a custom traits class.
</p> </p>
<a name="boost_regex.background_information.standards.unicode"></a><h5> <a name="boost_regex.background_information.standards.unicode"></a><h5>
<a name="id687125"></a> <a name="id687161"></a>
<a class="link" href="standards.html#boost_regex.background_information.standards.unicode">Unicode</a> <a class="link" href="standards.html#boost_regex.background_information.standards.unicode">Unicode</a>
</h5> </h5>
<p> <p>

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@ -34,7 +34,7 @@
Boost-specific enhanced interface. Boost-specific enhanced interface.
</p> </p>
<a name="boost_regex.ref.concepts.traits_concept.minimal_requirements_"></a><h5> <a name="boost_regex.ref.concepts.traits_concept.minimal_requirements_"></a><h5>
<a name="id661128"></a> <a name="id661185"></a>
<a class="link" href="traits_concept.html#boost_regex.ref.concepts.traits_concept.minimal_requirements_">Minimal <a class="link" href="traits_concept.html#boost_regex.ref.concepts.traits_concept.minimal_requirements_">Minimal
requirements.</a> requirements.</a>
</h5> </h5>
@ -381,7 +381,7 @@
</tbody> </tbody>
</table></div> </table></div>
<a name="boost_regex.ref.concepts.traits_concept.additional_optional_requirements"></a><h5> <a name="boost_regex.ref.concepts.traits_concept.additional_optional_requirements"></a><h5>
<a name="id661935"></a> <a name="id661996"></a>
<a class="link" href="traits_concept.html#boost_regex.ref.concepts.traits_concept.additional_optional_requirements">Additional <a class="link" href="traits_concept.html#boost_regex.ref.concepts.traits_concept.additional_optional_requirements">Additional
Optional Requirements</a> Optional Requirements</a>
</h5> </h5>

2
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@ -34,7 +34,7 @@
previous version of Boost.Regex and will not be further updated: previous version of Boost.Regex and will not be further updated:
</p> </p>
<a name="boost_regex.ref.deprecated_interfaces.regex_format.algorithm_regex_format"></a><h5> <a name="boost_regex.ref.deprecated_interfaces.regex_format.algorithm_regex_format"></a><h5>
<a name="id662675"></a> <a name="id662740"></a>
<a class="link" href="regex_format.html#boost_regex.ref.deprecated_interfaces.regex_format.algorithm_regex_format">Algorithm <a class="link" href="regex_format.html#boost_regex.ref.deprecated_interfaces.regex_format.algorithm_regex_format">Algorithm
regex_format</a> regex_format</a>
</h5> </h5>

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@ -27,7 +27,7 @@
<a name="boost_regex.ref.error_type"></a><a class="link" href="error_type.html" title="error_type"> error_type</a> <a name="boost_regex.ref.error_type"></a><a class="link" href="error_type.html" title="error_type"> error_type</a>
</h3></div></div></div> </h3></div></div></div>
<a name="boost_regex.ref.error_type.synopsis"></a><h5> <a name="boost_regex.ref.error_type.synopsis"></a><h5>
<a name="id640527"></a> <a name="id640585"></a>
<a class="link" href="error_type.html#boost_regex.ref.error_type.synopsis">Synopsis</a> <a class="link" href="error_type.html#boost_regex.ref.error_type.synopsis">Synopsis</a>
</h5> </h5>
<p> <p>
@ -57,7 +57,7 @@
</span><span class="special">}</span> <span class="comment">// namespace boost </span><span class="special">}</span> <span class="comment">// namespace boost
</span></pre> </span></pre>
<a name="boost_regex.ref.error_type.description"></a><h5> <a name="boost_regex.ref.error_type.description"></a><h5>
<a name="id641091"></a> <a name="id641149"></a>
<a class="link" href="error_type.html#boost_regex.ref.error_type.description">Description</a> <a class="link" href="error_type.html#boost_regex.ref.error_type.description">Description</a>
</h5> </h5>
<p> <p>

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@ -69,7 +69,7 @@
</span><span class="special">}</span> <span class="comment">// namespace boost </span><span class="special">}</span> <span class="comment">// namespace boost
</span></pre> </span></pre>
<a name="boost_regex.ref.match_flag_type.description"></a><h5> <a name="boost_regex.ref.match_flag_type.description"></a><h5>
<a name="id639762"></a> <a name="id639820"></a>
<a class="link" href="match_flag_type.html#boost_regex.ref.match_flag_type.description">Description</a> <a class="link" href="match_flag_type.html#boost_regex.ref.match_flag_type.description">Description</a>
</h5> </h5>
<p> <p>

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@ -43,7 +43,7 @@
on to the "real" algorithm. on to the "real" algorithm.
</p> </p>
<a name="boost_regex.ref.non_std_strings.icu.unicode_algo.u32regex_match"></a><h5> <a name="boost_regex.ref.non_std_strings.icu.unicode_algo.u32regex_match"></a><h5>
<a name="id643526"></a> <a name="id643583"></a>
<a class="link" href="unicode_algo.html#boost_regex.ref.non_std_strings.icu.unicode_algo.u32regex_match">u32regex_match</a> <a class="link" href="unicode_algo.html#boost_regex.ref.non_std_strings.icu.unicode_algo.u32regex_match">u32regex_match</a>
</h5> </h5>
<p> <p>
@ -89,7 +89,7 @@
<span class="special">}</span> <span class="special">}</span>
</pre> </pre>
<a name="boost_regex.ref.non_std_strings.icu.unicode_algo.u32regex_search"></a><h5> <a name="boost_regex.ref.non_std_strings.icu.unicode_algo.u32regex_search"></a><h5>
<a name="id644246"></a> <a name="id644302"></a>
<a class="link" href="unicode_algo.html#boost_regex.ref.non_std_strings.icu.unicode_algo.u32regex_search">u32regex_search</a> <a class="link" href="unicode_algo.html#boost_regex.ref.non_std_strings.icu.unicode_algo.u32regex_search">u32regex_search</a>
</h5> </h5>
<p> <p>
@ -128,7 +128,7 @@
<span class="special">}</span> <span class="special">}</span>
</pre> </pre>
<a name="boost_regex.ref.non_std_strings.icu.unicode_algo.u32regex_replace"></a><h5> <a name="boost_regex.ref.non_std_strings.icu.unicode_algo.u32regex_replace"></a><h5>
<a name="id644840"></a> <a name="id644896"></a>
<a class="link" href="unicode_algo.html#boost_regex.ref.non_std_strings.icu.unicode_algo.u32regex_replace">u32regex_replace</a> <a class="link" href="unicode_algo.html#boost_regex.ref.non_std_strings.icu.unicode_algo.u32regex_replace">u32regex_replace</a>
</h5> </h5>
<p> <p>

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@ -28,7 +28,7 @@
Unicode Aware Regex Iterators</a> Unicode Aware Regex Iterators</a>
</h5></div></div></div> </h5></div></div></div>
<a name="boost_regex.ref.non_std_strings.icu.unicode_iter.u32regex_iterator"></a><h5> <a name="boost_regex.ref.non_std_strings.icu.unicode_iter.u32regex_iterator"></a><h5>
<a name="id645300"></a> <a name="id645356"></a>
<a class="link" href="unicode_iter.html#boost_regex.ref.non_std_strings.icu.unicode_iter.u32regex_iterator">u32regex_iterator</a> <a class="link" href="unicode_iter.html#boost_regex.ref.non_std_strings.icu.unicode_iter.u32regex_iterator">u32regex_iterator</a>
</h5> </h5>
<p> <p>
@ -126,7 +126,7 @@
Provided of course that the input is encoded as UTF-8. Provided of course that the input is encoded as UTF-8.
</p> </p>
<a name="boost_regex.ref.non_std_strings.icu.unicode_iter.u32regex_token_iterator"></a><h5> <a name="boost_regex.ref.non_std_strings.icu.unicode_iter.u32regex_token_iterator"></a><h5>
<a name="id647046"></a> <a name="id647103"></a>
<a class="link" href="unicode_iter.html#boost_regex.ref.non_std_strings.icu.unicode_iter.u32regex_token_iterator">u32regex_token_iterator</a> <a class="link" href="unicode_iter.html#boost_regex.ref.non_std_strings.icu.unicode_iter.u32regex_token_iterator">u32regex_token_iterator</a>
</h5> </h5>
<p> <p>

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@ -34,7 +34,7 @@
here they are anyway: here they are anyway:
</p> </p>
<a name="boost_regex.ref.non_std_strings.mfc_strings.mfc_algo.regex_match"></a><h5> <a name="boost_regex.ref.non_std_strings.mfc_strings.mfc_algo.regex_match"></a><h5>
<a name="id652203"></a> <a name="id652259"></a>
<a class="link" href="mfc_algo.html#boost_regex.ref.non_std_strings.mfc_strings.mfc_algo.regex_match">regex_match</a> <a class="link" href="mfc_algo.html#boost_regex.ref.non_std_strings.mfc_strings.mfc_algo.regex_match">regex_match</a>
</h5> </h5>
<p> <p>
@ -82,7 +82,7 @@
<span class="special">}</span> <span class="special">}</span>
</pre> </pre>
<a name="boost_regex.ref.non_std_strings.mfc_strings.mfc_algo.regex_match__second_overload_"></a><h5> <a name="boost_regex.ref.non_std_strings.mfc_strings.mfc_algo.regex_match__second_overload_"></a><h5>
<a name="id653115"></a> <a name="id653171"></a>
<a class="link" href="mfc_algo.html#boost_regex.ref.non_std_strings.mfc_strings.mfc_algo.regex_match__second_overload_">regex_match <a class="link" href="mfc_algo.html#boost_regex.ref.non_std_strings.mfc_strings.mfc_algo.regex_match__second_overload_">regex_match
(second overload)</a> (second overload)</a>
</h5> </h5>
@ -110,7 +110,7 @@
<span class="special">}</span> <span class="special">}</span>
</pre> </pre>
<a name="boost_regex.ref.non_std_strings.mfc_strings.mfc_algo.regex_search"></a><h5> <a name="boost_regex.ref.non_std_strings.mfc_strings.mfc_algo.regex_search"></a><h5>
<a name="id653706"></a> <a name="id653763"></a>
<a class="link" href="mfc_algo.html#boost_regex.ref.non_std_strings.mfc_strings.mfc_algo.regex_search">regex_search</a> <a class="link" href="mfc_algo.html#boost_regex.ref.non_std_strings.mfc_strings.mfc_algo.regex_search">regex_search</a>
</h5> </h5>
<p> <p>
@ -149,7 +149,7 @@
<span class="special">}</span> <span class="special">}</span>
</pre> </pre>
<a name="boost_regex.ref.non_std_strings.mfc_strings.mfc_algo.regex_search__second_overload_"></a><h5> <a name="boost_regex.ref.non_std_strings.mfc_strings.mfc_algo.regex_search__second_overload_"></a><h5>
<a name="id654444"></a> <a name="id654500"></a>
<a class="link" href="mfc_algo.html#boost_regex.ref.non_std_strings.mfc_strings.mfc_algo.regex_search__second_overload_">regex_search <a class="link" href="mfc_algo.html#boost_regex.ref.non_std_strings.mfc_strings.mfc_algo.regex_search__second_overload_">regex_search
(second overload)</a> (second overload)</a>
</h5> </h5>
@ -164,7 +164,7 @@
<span class="special">+</span> <span class="identifier">s</span><span class="special">.</span><span class="identifier">GetLength</span><span class="special">(),</span> <span class="identifier">e</span><span class="special">,</span> <span class="identifier">f</span><span class="special">);</span></code> <span class="special">+</span> <span class="identifier">s</span><span class="special">.</span><span class="identifier">GetLength</span><span class="special">(),</span> <span class="identifier">e</span><span class="special">,</span> <span class="identifier">f</span><span class="special">);</span></code>
</p> </p>
<a name="boost_regex.ref.non_std_strings.mfc_strings.mfc_algo.regex_replace"></a><h5> <a name="boost_regex.ref.non_std_strings.mfc_strings.mfc_algo.regex_replace"></a><h5>
<a name="id654848"></a> <a name="id654904"></a>
<a class="link" href="mfc_algo.html#boost_regex.ref.non_std_strings.mfc_strings.mfc_algo.regex_replace">regex_replace</a> <a class="link" href="mfc_algo.html#boost_regex.ref.non_std_strings.mfc_strings.mfc_algo.regex_replace">regex_replace</a>
</h5> </h5>
<p> <p>

4
doc/html/boost_regex/ref/non_std_strings/mfc_strings/mfc_iter.html
View File

@ -32,7 +32,7 @@
an MFC/ATL string to a <a class="link" href="../../regex_iterator.html" title="regex_iterator"><code class="computeroutput"><span class="identifier">regex_iterator</span></code></a> or <a class="link" href="../../regex_token_iterator.html" title="regex_token_iterator"><code class="computeroutput"><span class="identifier">regex_token_iterator</span></code></a>: an MFC/ATL string to a <a class="link" href="../../regex_iterator.html" title="regex_iterator"><code class="computeroutput"><span class="identifier">regex_iterator</span></code></a> or <a class="link" href="../../regex_token_iterator.html" title="regex_token_iterator"><code class="computeroutput"><span class="identifier">regex_token_iterator</span></code></a>:
</p> </p>
<a name="boost_regex.ref.non_std_strings.mfc_strings.mfc_iter.regex_iterator_creation_helper"></a><h5> <a name="boost_regex.ref.non_std_strings.mfc_strings.mfc_iter.regex_iterator_creation_helper"></a><h5>
<a name="id655928"></a> <a name="id655985"></a>
<a class="link" href="mfc_iter.html#boost_regex.ref.non_std_strings.mfc_strings.mfc_iter.regex_iterator_creation_helper">regex_iterator <a class="link" href="mfc_iter.html#boost_regex.ref.non_std_strings.mfc_strings.mfc_iter.regex_iterator_creation_helper">regex_iterator
creation helper</a> creation helper</a>
</h5> </h5>
@ -68,7 +68,7 @@
<span class="special">}</span> <span class="special">}</span>
</pre> </pre>
<a name="boost_regex.ref.non_std_strings.mfc_strings.mfc_iter.regex_token_iterator_creation_helpers"></a><h5> <a name="boost_regex.ref.non_std_strings.mfc_strings.mfc_iter.regex_token_iterator_creation_helpers"></a><h5>
<a name="id656677"></a> <a name="id656734"></a>
<a class="link" href="mfc_iter.html#boost_regex.ref.non_std_strings.mfc_strings.mfc_iter.regex_token_iterator_creation_helpers">regex_token_iterator <a class="link" href="mfc_iter.html#boost_regex.ref.non_std_strings.mfc_strings.mfc_iter.regex_token_iterator_creation_helpers">regex_token_iterator
creation helpers</a> creation helpers</a>
</h5> </h5>

8
doc/html/boost_regex/ref/posix.html
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@ -165,7 +165,7 @@
<a name="regcomp"></a><p> <a name="regcomp"></a><p>
</p> </p>
<a name="boost_regex.ref.posix.regcomp"></a><h5> <a name="boost_regex.ref.posix.regcomp"></a><h5>
<a name="id659594"></a> <a name="id659651"></a>
<a class="link" href="posix.html#boost_regex.ref.posix.regcomp">regcomp</a> <a class="link" href="posix.html#boost_regex.ref.posix.regcomp">regcomp</a>
</h5> </h5>
<p> <p>
@ -379,7 +379,7 @@
<a name="regerror"></a><p> <a name="regerror"></a><p>
</p> </p>
<a name="boost_regex.ref.posix.regerror"></a><h5> <a name="boost_regex.ref.posix.regerror"></a><h5>
<a name="id660238"></a> <a name="id660295"></a>
<a class="link" href="posix.html#boost_regex.ref.posix.regerror">regerror</a> <a class="link" href="posix.html#boost_regex.ref.posix.regerror">regerror</a>
</h5> </h5>
<p> <p>
@ -467,7 +467,7 @@
<a name="regexec"></a><p> <a name="regexec"></a><p>
</p> </p>
<a name="boost_regex.ref.posix.regexec"></a><h5> <a name="boost_regex.ref.posix.regexec"></a><h5>
<a name="id660421"></a> <a name="id660478"></a>
<a class="link" href="posix.html#boost_regex.ref.posix.regexec">regexec</a> <a class="link" href="posix.html#boost_regex.ref.posix.regexec">regexec</a>
</h5> </h5>
<p> <p>
@ -537,7 +537,7 @@
<a name="regfree"></a><p> <a name="regfree"></a><p>
</p> </p>
<a name="boost_regex.ref.posix.regfree"></a><h5> <a name="boost_regex.ref.posix.regfree"></a><h5>
<a name="id660563"></a> <a name="id660619"></a>
<a class="link" href="posix.html#boost_regex.ref.posix.regfree">regfree</a> <a class="link" href="posix.html#boost_regex.ref.posix.regfree">regfree</a>
</h5> </h5>
<p> <p>

2
doc/html/boost_regex/ref/regex_traits.html
View File

@ -46,7 +46,7 @@
<span class="special">}</span> <span class="comment">// namespace boost <span class="special">}</span> <span class="comment">// namespace boost
</span></pre> </span></pre>
<a name="boost_regex.ref.regex_traits.description"></a><h5> <a name="boost_regex.ref.regex_traits.description"></a><h5>
<a name="id641773"></a> <a name="id641830"></a>
<a class="link" href="regex_traits.html#boost_regex.ref.regex_traits.description">Description</a> <a class="link" href="regex_traits.html#boost_regex.ref.regex_traits.description">Description</a>
</h5> </h5>
<p> <p>

17
doc/html/boost_regex/ref/syntax_option_type/syntax_option_type_perl.html
View File

@ -372,6 +372,23 @@
</td> </td>
</tr> </tr>
<tr> <tr>
<td>
<p>
no_empty_expressions
</p>
</td>
<td>
<p>
No
</p>
</td>
<td>
<p>
When set then empty expressions/alternatives are prohibited.
</p>
</td>
</tr>
<tr>
<td> <td>
<p> <p>
save_subexpression_location save_subexpression_location

1
doc/html/boost_regex/ref/syntax_option_type/syntax_option_type_synopsis.html
View File

@ -69,6 +69,7 @@
<span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">syntax_option_type</span> <span class="identifier">no_mod_s</span><span class="special">;</span> <span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">syntax_option_type</span> <span class="identifier">no_mod_s</span><span class="special">;</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">syntax_option_type</span> <span class="identifier">mod_s</span><span class="special">;</span> <span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">syntax_option_type</span> <span class="identifier">mod_s</span><span class="special">;</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">syntax_option_type</span> <span class="identifier">mod_x</span><span class="special">;</span> <span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">syntax_option_type</span> <span class="identifier">mod_x</span><span class="special">;</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">syntax_option_type</span> <span class="identifier">no_empty_expressions</span><span class="special">;</span>
<span class="comment">// POSIX extended specific options: <span class="comment">// POSIX extended specific options:
</span><span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">syntax_option_type</span> <span class="identifier">no_escape_in_lists</span><span class="special">;</span> </span><span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">syntax_option_type</span> <span class="identifier">no_escape_in_lists</span><span class="special">;</span>

2
doc/html/index.html
View File

@ -196,7 +196,7 @@
</p> </p>
</div> </div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"><p><small>Last revised: December 22, 2008 at 19:39:18 GMT</small></p></td> <td align="left"><p><small>Last revised: December 23, 2008 at 17:35:37 GMT</small></p></td>
<td align="right"><div class="copyright-footer"></div></td> <td align="right"><div class="copyright-footer"></div></td>
</tr></table> </tr></table>
<hr> <hr>

2
doc/syntax_option_type.qbk
View File

@ -50,6 +50,7 @@ duplicated within the scope of class template [basic_regex].
static const syntax_option_type no_mod_s; static const syntax_option_type no_mod_s;
static const syntax_option_type mod_s; static const syntax_option_type mod_s;
static const syntax_option_type mod_x; static const syntax_option_type mod_x;
static const syntax_option_type no_empty_expressions;
// POSIX extended specific options: // POSIX extended specific options:
static const syntax_option_type no_escape_in_lists; static const syntax_option_type no_escape_in_lists;
@ -151,6 +152,7 @@ The following options may also be set when using perl-style regular expressions:
whether `match_not_dot_newline` is set in the match flags.]] whether `match_not_dot_newline` is set in the match flags.]]
[[mod_x][No][Turns on the perl x-modifier: causes unescaped whitespace [[mod_x][No][Turns on the perl x-modifier: causes unescaped whitespace
in the expression to be ignored.]] in the expression to be ignored.]]
[[no_empty_expressions][No][When set then empty expressions/alternatives are prohibited.]]
[[save_subexpression_location][No][When set then the locations of individual [[save_subexpression_location][No][When set then the locations of individual
sub-expressions within the ['original regular expression string] can be accessed sub-expressions within the ['original regular expression string] can be accessed
via the [link boost_regex.basic_regex.subexpression `subexpression()`] member function of `basic_regex`.]] via the [link boost_regex.basic_regex.subexpression `subexpression()`] member function of `basic_regex`.]]

25
include/boost/regex/v4/basic_regex_parser.hpp
View File

@ -109,7 +109,11 @@ void basic_regex_parser<charT, traits>::parse(const charT* p1, const charT* p2,
m_position = m_base = p1; m_position = m_base = p1;
m_end = p2; m_end = p2;
// empty strings are errors: // empty strings are errors:
if(p1 == p2) if((p1 == p2) &&
(
(l_flags & regbase::main_option_type) != regbase::perl_syntax_group)
|| (l_flags & regbase::no_empty_expressions)
)
{ {
fail(regex_constants::error_empty, 0); fail(regex_constants::error_empty, 0);
return; return;
@ -926,7 +930,15 @@ bool basic_regex_parser<charT, traits>::parse_alt()
// error check: if there have been no previous states, // error check: if there have been no previous states,
// or if the last state was a '(' then error: // or if the last state was a '(' then error:
// //
if((this->m_last_state == 0) || (this->m_last_state->type == syntax_element_startmark)) if(
((this->m_last_state == 0) || (this->m_last_state->type == syntax_element_startmark))
&&
!(
((this->flags() & regbase::main_option_type) == regbase::perl_syntax_group)
&&
((this->flags() & regbase::no_empty_expressions) == 0)
)
)
{ {
fail(regex_constants::error_empty, this->m_position - this->m_base); fail(regex_constants::error_empty, this->m_position - this->m_base);
return false; return false;
@ -2075,7 +2087,14 @@ bool basic_regex_parser<charT, traits>::unwind_alts(std::ptrdiff_t last_paren_st
// alternative then that's an error: // alternative then that's an error:
// //
if((this->m_alt_insert_point == static_cast<std::ptrdiff_t>(this->m_pdata->m_data.size())) if((this->m_alt_insert_point == static_cast<std::ptrdiff_t>(this->m_pdata->m_data.size()))
&& m_alt_jumps.size() && (m_alt_jumps.back() > last_paren_start)) && m_alt_jumps.size() && (m_alt_jumps.back() > last_paren_start)
&&
!(
((this->flags() & regbase::main_option_type) == regbase::perl_syntax_group)
&&
((this->flags() & regbase::no_empty_expressions) == 0)
)
)
{ {
fail(regex_constants::error_empty, this->m_position - this->m_base); fail(regex_constants::error_empty, this->m_position - this->m_base);
return false; return false;

2
include/boost/regex/v4/regbase.hpp
View File

@ -85,6 +85,7 @@ public:
collate = 1 << 21, // use locale specific collation collate = 1 << 21, // use locale specific collation
nosubs = 1 << 22, // don't mark sub-expressions nosubs = 1 << 22, // don't mark sub-expressions
save_subexpression_location = 1 << 23, // save subexpression locations save_subexpression_location = 1 << 23, // save subexpression locations
no_empty_expressions = 1 << 24, // no empty expressions allowed
optimize = 0, // not really supported optimize = 0, // not really supported
@ -143,6 +144,7 @@ namespace regex_constants{
mod_s = ::boost::regbase::mod_s, mod_s = ::boost::regbase::mod_s,
no_mod_s = ::boost::regbase::no_mod_s, no_mod_s = ::boost::regbase::no_mod_s,
save_subexpression_location = ::boost::regbase::save_subexpression_location, save_subexpression_location = ::boost::regbase::save_subexpression_location,
no_empty_expressions = ::boost::regbase::no_empty_expressions,
basic = ::boost::regbase::basic, basic = ::boost::regbase::basic,
extended = ::boost::regbase::extended, extended = ::boost::regbase::extended,

3
test/regress/basic_tests.cpp
View File

@ -42,7 +42,8 @@ void basic_tests()
TEST_REGEX_SEARCH("()", perl, "zzz", match_default, make_array(0, 0, 0, 0, -2, 1, 1, 1, 1, -2, 2, 2, 2, 2, -2, 3, 3, 3, 3, -2, -2)); TEST_REGEX_SEARCH("()", perl, "zzz", match_default, make_array(0, 0, 0, 0, -2, 1, 1, 1, 1, -2, 2, 2, 2, 2, -2, 3, 3, 3, 3, -2, -2));
TEST_REGEX_SEARCH("()", perl, "", match_default, make_array(0, 0, 0, 0, -2, -2)); TEST_REGEX_SEARCH("()", perl, "", match_default, make_array(0, 0, 0, 0, -2, -2));
TEST_INVALID_REGEX("(", perl); TEST_INVALID_REGEX("(", perl);
TEST_INVALID_REGEX("", perl); TEST_INVALID_REGEX("", perl|no_empty_expressions);
TEST_REGEX_SEARCH("", perl, "abc", match_default, make_array(0, 0, -2, 1, 1, -2, 2, 2, -2, 3, 3, -2, -2));
TEST_INVALID_REGEX(")", perl); TEST_INVALID_REGEX(")", perl);
TEST_INVALID_REGEX("(aa", perl); TEST_INVALID_REGEX("(aa", perl);
TEST_INVALID_REGEX("aa)", perl); TEST_INVALID_REGEX("aa)", perl);

61
test/regress/main.cpp
View File

@ -33,38 +33,43 @@ int* get_array_data();
int error_count = 0; int error_count = 0;
#define RUN_TESTS(name) \
std::cout << "Running test case \"" #name "\".\n";\
name();
void run_tests() void run_tests()
{ {
basic_tests(); RUN_TESTS(basic_tests);
test_simple_repeats(); RUN_TESTS(test_simple_repeats);
test_alt(); RUN_TESTS(test_alt);
test_sets(); RUN_TESTS(test_sets);
test_sets2(); RUN_TESTS(test_sets2);
test_anchors(); RUN_TESTS(test_anchors);
test_backrefs(); RUN_TESTS(test_backrefs);
test_character_escapes(); RUN_TESTS(test_character_escapes);
test_assertion_escapes(); RUN_TESTS(test_assertion_escapes);
test_tricky_cases(); RUN_TESTS(test_tricky_cases);
test_grep(); RUN_TESTS(test_grep);
test_replace(); RUN_TESTS(test_replace);
test_non_greedy_repeats(); RUN_TESTS(test_non_greedy_repeats);
test_non_marking_paren(); RUN_TESTS(test_non_marking_paren);
test_partial_match(); RUN_TESTS(test_partial_match);
test_forward_lookahead_asserts(); RUN_TESTS(test_forward_lookahead_asserts);
test_fast_repeats(); RUN_TESTS(test_fast_repeats);
test_fast_repeats2(); RUN_TESTS(test_fast_repeats2);
test_independent_subs(); RUN_TESTS(test_independent_subs);
test_nosubs(); RUN_TESTS(test_nosubs);
test_conditionals(); RUN_TESTS(test_conditionals);
test_options(); RUN_TESTS(test_options);
test_options2(); RUN_TESTS(test_options2);
#ifndef TEST_THREADS #ifndef TEST_THREADS
test_en_locale(); RUN_TESTS(test_en_locale);
#endif #endif
test_emacs(); RUN_TESTS(test_emacs);
test_operators(); RUN_TESTS(test_operators);
test_overloads(); RUN_TESTS(test_overloads);
test_unicode(); RUN_TESTS(test_unicode);
} }
int cpp_main(int /*argc*/, char * /*argv*/[]) int cpp_main(int /*argc*/, char * /*argv*/[])

15
test/regress/test_alt.cpp
View File

@ -29,11 +29,16 @@ void test_alt()
TEST_REGEX_SEARCH("a(b|c)", perl, "ad", match_default, make_array(-2, -2)); TEST_REGEX_SEARCH("a(b|c)", perl, "ad", match_default, make_array(-2, -2));
TEST_REGEX_SEARCH("(a|b|c)", perl, "c", match_default, make_array(0, 1, 0, 1, -2, -2)); TEST_REGEX_SEARCH("(a|b|c)", perl, "c", match_default, make_array(0, 1, 0, 1, -2, -2));
TEST_REGEX_SEARCH("(a|(b)|.)", perl, "b", match_default, make_array(0, 1, 0, 1, 0, 1, -2, -2)); TEST_REGEX_SEARCH("(a|(b)|.)", perl, "b", match_default, make_array(0, 1, 0, 1, 0, 1, -2, -2));
TEST_INVALID_REGEX("|c", perl); TEST_INVALID_REGEX("|c", perl|no_empty_expressions);
TEST_INVALID_REGEX("c|", perl); TEST_REGEX_SEARCH("|c", perl, " c", match_default, make_array(0, 0, -2, 1, 1, -2, 1, 2, -2, 2, 2, -2, -2));
TEST_INVALID_REGEX("(|)", perl); TEST_INVALID_REGEX("c|", perl|no_empty_expressions);
TEST_INVALID_REGEX("(a|)", perl); TEST_REGEX_SEARCH("c|", perl, " c", match_default, make_array(0, 0, -2, 1, 2, -2, 2, 2, -2, -2));
TEST_INVALID_REGEX("(|a)", perl); TEST_INVALID_REGEX("(|)", perl|no_empty_expressions);
TEST_REGEX_SEARCH("(|)", perl, " c", match_default, make_array(0, 0, 0, 0, -2, 1, 1, 1, 1, -2, 2, 2, 2, 2, -2, -2));
TEST_INVALID_REGEX("(a|)", perl|no_empty_expressions);
TEST_REGEX_SEARCH("(a|)", perl, " a", match_default, make_array(0, 0, 0, 0, -2, 1, 2, 1, 2, -2, 2, 2, 2, 2, -2, -2));
TEST_INVALID_REGEX("(|a)", perl|no_empty_expressions);
TEST_REGEX_SEARCH("(|a)", perl, " a", match_default, make_array(0, 0, 0, 0, -2, 1, 1, 1, 1, -2, 1, 2, 1, 2, -2, 2, 2, 2, 2, -2, -2));
TEST_REGEX_SEARCH("a\\|", perl, "a|", match_default, make_array(0, 2, -2, -2)); TEST_REGEX_SEARCH("a\\|", perl, "a|", match_default, make_array(0, 2, -2, -2));
TEST_REGEX_SEARCH("a|", basic, "a|", match_default, make_array(0, 2, -2, -2)); TEST_REGEX_SEARCH("a|", basic, "a|", match_default, make_array(0, 2, -2, -2));

2
test/regress/test_deprecated.cpp
View File

@ -38,7 +38,7 @@ int get_posix_compile_options(boost::regex_constants::syntax_option_type opts)
{ {
case regbase::perl: case regbase::perl:
result = (opts & regbase::no_perl_ex) ? REG_EXTENDED : REG_PERL; result = (opts & regbase::no_perl_ex) ? REG_EXTENDED : REG_PERL;
if(opts & (regbase::no_bk_refs|regbase::no_mod_m|regbase::mod_x|regbase::mod_s|regbase::no_mod_s|regbase::no_escape_in_lists)) if(opts & (regbase::no_bk_refs|regbase::no_mod_m|regbase::mod_x|regbase::mod_s|regbase::no_mod_s|regbase::no_escape_in_lists|regbase::no_empty_expressions))
return -1; return -1;
break; break;
case regbase::basic: case regbase::basic: