+# Parens work fine
+RT->Config->Set( EmailSubjectTagRegex => qr/(new|)(site)/ );
+is(RT::Interface::Email::ParseTicketId("[site #123] test"), 123);
+is(RT::Interface::Email::ParseTicketId("[newsite #123] test"), 123);
+is(RT::Interface::Email::ParseTicketId("[othersite #123] test"), undef);