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Re: address@hidden: Mail delivery failed: returning message to sender]
From: |
Akim Demaille |
Subject: |
Re: address@hidden: Mail delivery failed: returning message to sender] |
Date: |
17 Dec 2000 15:30:43 +0100 |
User-agent: |
Gnus/5.0807 (Gnus v5.8.7) XEmacs/21.1 (Channel Islands) |
Hope this helps...
@item @command{egrep}
@c ------------------
@cindex @command{egrep}
The empty alternative is not portable, use @samp{?} instead. For
instance with Digital Unix v5.0:
@example
> printf "foo\n|foo\n" | egrep '^(|foo|bar)$'
|foo
> printf "bar\nbar|\n" | egrep '^(foo|bar|)$'
bar|
> printf "foo\nfoo|\n|bar\nbar\n" | egrep '^(foo||bar)$'
foo
|bar
@end example
@command{egrep} also suffers the limitations of @command{grep}.