On Tue, Mar 18, 2008 at 08:21:09AM -0700, Stephane Payrard wrote:
> 
> A  <?before> rule with a space between the '<' and the '?' compiles
> but fails at execution
> with the unhelpful message :
> Unable to find regex  ''
> Null PMC access in invoke()

I agree that this is not a useful error message.  However, when
PGE is corrected to follow the specification the regex

  < ?before foo>

would be identical to

  '?before' | 'foo'

and no error message would be generated at all.  

(PGE hasn't been updated to recognize the < a b c > form of
alternation.)

Pm

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