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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
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10
doc/html/boost_regex/background_information/standards.html
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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>
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<a class="link" href="standards.html#boost_regex.background_information.standards.unicode">Unicode</a>
</h5>
<p>