http://qs321.pair.com?node_id=390078


in reply to On zero-width negative lookahead assertions

The following works if you break it into two expressions, but I can't see why yours doesn't match. 

  perl -ne '/^root:\s*/ and $_ !~ /admin\@somewhere\.here/ and print' 
+alias

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Update: Moving it around also works: 
  perl -ne '/^root:(?!\s*admin\@somewhere\.here)/ and print' alias

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pbeckingham - typist, perishable vertebrate.

In Section Seekers of Perl Wisdom