[boost] regex lib bug: \u and icase

From: Benzinger, Ralph (ralph.benzinger_at_[hidden])
Date: 2004-05-12 04:46:13

Hello,

Regular expressions "[\u]" and "\u", unlike "[[:upper:]]", will not match any letters when the icase flag is set.  Similarly, "\U" will match anything.  Expressions "\l" and "\L" seem to be fine due to the lower_case_map[] translation.

My suggestion would be to replace

    classes.push(traits_type::char_class_upper);

and the like by

    classes.push((_flags & regex_constants::icase) ?
                 traits_type::char_class_alpha :
                 traits_type::char_class_upper);

in the 'syntax_u/U/l/L' cases in set_compile() and set_expression().  This approach is currently taken in the 'syntax_open_set' case in set_compile().

John may have a different fix in mind, though. :-)

Regards,
Ralph