[Bug: 21.5-b28] Could you please turn on `RE_CHAR_CLASSES' for XEmacs?

[Stephen J. Turnbull]

Steve Youngs writes:

 > We enabled character classes in SXEmacs 22.1.8 (Mule is enable by
 > default in SXEmacs), so far no related crashes.  Steve, if you can give
 > me some hairy test cases, I'll be happy to let you know how SXEmacs
 > stands up to it.

Well, on second thought I take the worries about crashes back.  These
are just character classes, same as any other.

The main question is how the character classes are constructed in Mule.

Eg, you would hope that "^[[:word:]]+ [[:word:]]+$" would match
"Hrvoje Nikšić" and 
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"^?? ??$", as well as "Steve Youngs".