forked from boostorg/regex
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]. Fixes #1081. [SVN r50374]
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@ -38,7 +38,7 @@ int get_posix_compile_options(boost::regex_constants::syntax_option_type opts)
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{
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case regbase::perl:
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result = (opts & regbase::no_perl_ex) ? REG_EXTENDED : REG_PERL;
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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))
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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))
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return -1;
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break;
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case regbase::basic:
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