Re: grep AND regular expression

From: Barry Margolin (barry.margolin_at_level3.com)
Date: 11/07/03

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    In article <17581f0c.0311070822.3b5fa7a1@posting.google.com>,
    Vinod Gupta <vkgupta@princeton.edu> wrote:
    >While one could search for str1 OR str2 by egrep "str1|str2",
    >what would be the regular expression to search for str1 AND str2?

    For very simple cases you can do:

    grep -E 'str1.*str2|str2.*str1'

    but this doesn't generalize very well because of combinatorial explosion
    (and it also fails completely if str1 and str2 overlap). The more general
    way to solve it is with piping:

    grep 'str1' | grep 'str2' | grep 'str3' ... 

    -- 
Barry Margolin, barry.margolin@level3.com
Level(3), Woburn, MA
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