Re: [boost] regex lib bug: \u and icase

From: John Maddock (john_at_[hidden])
Date: 2004-05-12 05:29:43

> 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. :-)

Thanks, I'm actually in the process of rewriting all the expression parsing
code, so yes the fix will be different, although for the time being, I'll
commit the fix you suggested.

John.