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Re: grep bug
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From: |
Dave B |
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Subject: |
Re: grep bug |
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Date: |
Mon, 11 May 2009 23:58:21 +0200 |
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User-agent: |
Thunderbird 2.0.0.21 (X11/20090420) |
Erickson, John wrote:
> The following grep returns no matches:
>
> echo " hello" | grep -o '\w*'
>
> whereas if I omit the leading spaces, it will return the match.
>
> This seems to be a bug.
>
> This is GNU grep 2.5.1
\w* matches the empty pattern, which is at the beginning of the string
(before the space). You probably want \w\+ or \w\{1,\}
--
D.