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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/html/boost_regex/background_information/examples.html
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@ -28,7 +28,7 @@
Example Programs</a>
</h3></div></div></div>
<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
Programs</a>
</h5>
@ -107,7 +107,7 @@
Files: <a href="../../../../test/captures/captures_test.cpp" target="_top">captures_test.cpp</a>.
</p>
<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
programs</a>
</h5>
@ -133,7 +133,7 @@
Files: <a href="../../../../example/timer/regex_timer.cpp" target="_top">regex_timer.cpp</a>.
</p>
<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
snippets</a>
</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>
</h3></div></div></div>
<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
1.38</a>
</h5>
<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>
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>).
@ -40,12 +47,13 @@
regular expression string (issue <a href="https://svn.boost.org/trac/boost/ticket/2269" target="_top">#2269</a>).
</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>.
</li>
</ul></div>
<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
1.34</a>
</h5>
@ -68,7 +76,7 @@
</li>
</ul></div>
<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
1.33.1</a>
</h5>
@ -138,7 +146,7 @@
</li>
</ul></div>
<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
1.33.0</a>
</h5>
@ -193,7 +201,7 @@
</li>
</ul></div>
<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
1.32.1</a>
</h5>
@ -201,7 +209,7 @@
Fixed bug in partial matches of bounded repeats of '.'.
</li></ul></div>
<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
1.31.0</a>
</h5>

8
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@ -58,7 +58,7 @@
There are three separate localization mechanisms supported by Boost.Regex:
</p>
<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
localization model.</a>
</h5>
@ -90,7 +90,7 @@
are treated as "unknown" graphic characters.
</p>
<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
localization model.</a>
</h5>
@ -114,7 +114,7 @@
libraries including version 1 of this library.
</p>
<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++
localization model.</a>
</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>.
</p>
<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 message catalogue</a>
</h5>

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@ -28,7 +28,7 @@
Conformance</a>
</h3></div></div></div>
<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>
</h5>
<p>
@ -36,7 +36,7 @@
Report on C++ Library Extensions</a>.
</p>
<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
/ JavaScript</a>
</h5>
@ -49,7 +49,7 @@
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="id687040"></a>
<a name="id687075"></a>
<a class="link" href="standards.html#boost_regex.background_information.standards.perl">Perl</a>
</h5>
<p>
@ -62,7 +62,7 @@
(??{code}) Not implementable in a compiled strongly typed language.
</p>
<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>
</h5>
<p>
@ -82,7 +82,7 @@
a custom traits class.
</p>
<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>
</h5>
<p>