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Reiner Steib <4uce.02.r.steib@gmx.net> writes:

> [1] E.g., what's the Lisp-RE equivalent for "^[0-9][0-9a-fA-F]{3,3}"?
                                                                ^^^^^

This works in Emacs 21.  Dunno about XEmacs.

> Is "^[0-9][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][^0-9a-fA-F]" correct?

I think so.  It isn't pretty, but it should work.