In Bugzilla mail the URL for 'Created an attachment' are within '(' and
')', with no text after the ')', example:
  --> (http://bugzilla.mozilla.org/attachment.cgi?id=123&action=view)

When viewing such a mail in Mutt (CLI mailer), gnome-terminal thinks the
')' is part of the URL. This is because the regexp matches a newline.

To reproduce (using only a shell):
1. Open a new gnome-terminal window
2. Type in: echo '(http:///a.b.c/defghi) foobar'
3. Press Enter
4. Mouse the mouse over 'defghi'
-- http://a.b.c/defghi is underscored
5. Type in: echo '(http:///a.b.c/jklmno)'
6. Press Enter
7. Mouse the mouse over 'jklmno'

Expected result:
http:///a.b.c/jklmno is underscored

Actual result:
http:///a.b.c/jklmno) is underscored
Note the ')'

I will attach a patch which adds \t, \r and \n to the characters that can't
be matched.