From mboxrd@z Thu Jan  1 00:00:00 1970
Message-Id: <B0C1D211-FFCA-4447-9E39-3362A75C8741@lsub.org>
From: Enrique Soriano <esoriano@lsub.org>
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
In-Reply-To: <138575260906030756u287ecfe6x5085e3d11ed0a367@mail.gmail.com>
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Date: Wed,  3 Jun 2009 19:19:16 +0200
References: <138575260906030756u287ecfe6x5085e3d11ed0a367@mail.gmail.com>
Subject: Re: [9fans] plan 9 regexp
Topicbox-Message-UUID: 03de8c54-ead5-11e9-9d60-3106f5b1d025

> But then, how exactly the '?' operator is useful for grep? I was

Suppose we want to filter file names ending
in '.jpg' and '.jpeg'. We would use this regexp:

; ls | grep '\.jpe?g$'

The 'e' is optional (zero or one 'e').

Q