p4raw-id: //depot/perl@9898
=item invalid [] range "%s" in regexp
(F) The range specified in a character class had a minimum character
-greater than the maximum character. See L<perlre>.
+greater than the maximum character. One possibility is that you
+forgot the C<{}> from your ending C<\x{}> - C<\x> without the curly
+braces can go only up to C<ff>. See L<perlre>.
=item invalid [] range "%s" in transliteration operator