re.c: match? should return nil if no match
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@55067 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
re.c: match? should return nil if no match
document says. [Feature #8110]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@55067 b2dd03c8-39d4-4d8f-98ff-823fe69b080e