re.c: char boundary
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@57051 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
re.c: char boundary
does not adjust to the boundary if len == 0.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@57051 b2dd03c8-39d4-4d8f-98ff-823fe69b080e