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List:       freebsd-hackers
Subject:    Re: replacing grep(1)
From:       Tim Vanderhoek <vanderh () ecf ! utoronto ! ca>
Date:       1999-07-31 23:39:30
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On Sat, Jul 31, 1999 at 11:56:16PM +0200, Sheldon Hearn wrote:
> 
> > b$ time ./grep -E '(vt100)|(printer)' longfile > /dev/null
> > b$ time grep '(vt100)|(printer)' longfile > /dev/null
> 
> You think that's fair? Surely you can't expect Jamie's extended regex
> support to outperform GNU's simple regex support? :-)

GNU has no simple regex support.

Actually, neither did Jamie's by the time I did that test, but I added
the -E flag to make it obvious what was going on.  :)

I rather hope that the rumoured newer version of H. Spencer's regex
lib is faster...  Being as slow for that pattern as it is has got to
be a bug of some sort...  It's actually faster to scan the file twice,
once for the first string and then for the second.


-- 
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