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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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@ -10,6 +10,12 @@
[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
(issue [@https://svn.boost.org/trac/boost/ticket/2556 #2556]).
* Added support for accessing the location of sub-expressions within the