[Bug:21.4.16] regex.c and xemacs hangs.

Hi, please, review the latest commit to regex.c from xemacs-21.4 branch: --8<---------------cut here---------------start------------->8--- 2004-10-07 Stephen J. Turnbull <stephen(a)xemacs.org&gt; * regex.c (re_match_2_internal): Map internal to external registers. Fixes bug identified by Steve Youngs 2004-09-30 <microsoft-free.87ekkjhj7t.fsf(a)youngs.au.com&gt;. --8<---------------cut here---------------end--------------->8--- If i am saved the edited text(combination C-x C-s), xemacs is hang. When i'm reverting this changes, xemacs is good working. -- Regards, Andrey.