https://issues.apache.org/SpamAssassin/show_bug.cgi?id=5380





--- Comment #8 from Karsten Bräckelmann <[email protected]>  2009-08-20 
06:46:51 PST ---
(In reply to comment #6)
> Performance question: which is more efficient?

They are not equivalent.

  "a_x" =~ /(?:\b|_)x(?:\b|_)/  &&  "a_x" !~ /\b_*x_*\b/

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