change valid domain regex to work with oniguruma:
change valid domain regex to work with oniguruma:

1.8: [:punct:] is any printable character excluding aplhanumeric or space
1.9: <, >, etc, is not punctuation in unicode: http://redmine.ruby-lang.org/issues/3217

omalab/postrank-uri,swiftype/postrank-uri,postrank-labs/postrank-uri