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Date: Wed,  4 Mar 2009 11:31:47 +1100
Message-ID: <7359f0490903031631o55358b62ic9dd947d83e410b3@mail.gmail.com>
From: Rob Pike <robpike@gmail.com>
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
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Subject: Re: [9fans] command repetition in sam/acme
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Sam and Acme use a simple, pure form of regular expressions.  If they
had the counting operations, this would be a trivial task, but to add
them would open the door to the enormous, ill-conceived complexity of
(no longer) regular expressions as the open source community thinks of
them.

So yes: use other tools, with my apologies.

-rob