Issue #1889 has been updated by Yui NARUSE. RE.txt is for original Oniguruma, not for Ruby 1.9's regexp. We may need our own document. I think, POSIX properties should follow UTS18. If you have a patch, I'll merge it. ---------------------------------------- http://redmine.ruby-lang.org/issues/show/1889 ---------------------------------------- http://redmine.ruby-lang.org