escaping - in /u RegExp

Allen Wirfs-Brock allen at
Tue Jan 13 13:23:54 PST 2015

Would those of you who consider yourselves RegExp experts take a look at  Is this a bug? If so, what is the fix?

This construction for Identity Escape goes back to Norbert's original proposal 

Perhaps we need to add a:
  ClassAttom[U] :: [+U]  \-

production or some such to the pattern grammar.

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