John Maddock wrote:
Imagine I write a traits class which recognizes [[:fubar:]], and the "fubar" char class happens to be case-sensitive. How is the regex engine to know that? And how should it do a case-insensitive match of a character against the [[:fubar:]] char class? John, can you confirm this is a legitimate problem?
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In fact I suspect this may be a real bug in the current Boost.Regex Unicode support: matching a case insensitive [[:Ll:]] will only match lower case letters. Although frankly which of the other L* categories it should match is an open question: should it match Lo or Lm for example?
Wow, I don't know. Do whatever ICU does. :-) My guess is no, the Lo and Lm categories don't seem to be involved in case folding. OK, I'll file another DR. -- Eric Niebler Boost Consulting www.boost-consulting.com