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Full Discussion: Finding a pattern with grep
Top Forums UNIX for Dummies Questions & Answers Finding a pattern with grep Post 302504614 by sgruenwald on Tuesday 15th of March 2011 03:29:25 AM
Old 03-15-2011
Reply to vistastar
Hi vistastar:

Then one has to do the following:

grep -E '(.)\1(.)\2\1(.)\3' testfile | grep -Ev '.(.)\1.{4}' | grep -Ev '...(.)\1.{2}' | grep -Ev '....(.)\1.' | grep -Ev '...(.).\1.'

the grep -Ev (extended negated option) tests whether second A is not first B '.(.)\1.{4}' and second B is not third A '...(.)\1.{2}' and third A is not first C '....(.)\1.' and second B is not first C '....(.)\1.' -- the other combinations are tested by the first expression. Here is a test of it:

Stefans-Computer:~ stefangr$ echo 'AABBACC' > testfile
Stefans-Computer:~ stefangr$ grep -E '(.)\1(.)\2\1(.)\3' testfile | grep -Ev '.(.)\1.{4}' | grep -Ev '...(.)\1.{2}' | grep -Ev '....(.)\1.' | grep -Ev '...(.).\1.'
AABBACC
Stefans-Computer:~ stefangr$ echo 'AAAACCC' > testfile
Stefans-Computer:~ stefangr$ grep -E '(.)\1(.)\2\1(.)\3' testfile | grep -Ev '.(.)\1.{4}' | grep -Ev '...(.)\1.{2}' | grep -Ev '....(.)\1.' | grep -Ev '...(.).\1.'
Stefans-Computer:~ stefangr$
 

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LEARN ABOUT LINUX

xzegrep

XZGREP(1)							     XZ Utils								 XZGREP(1)

NAME

       xzgrep - search compressed files for a regular expression

SYNOPSIS

       xzgrep [grep_options] [-e] pattern file...
       xzegrep ...
       xzfgrep ...
       lzgrep ...
       lzegrep ...
       lzfgrep ...

DESCRIPTION

       xzgrep  invokes	grep(1)  on  files  which may be either uncompressed or compressed with xz(1), lzma(1), gzip(1), or bzip2(1).  All options
       specified are passed directly to grep(1).

       If no file is specified, then standard input is decompressed if necessary and fed to grep(1).  When reading from  standard  input,  gzip(1)
       and bzip2(1) compressed files are not supported.

       If  xzgrep  is  invoked as xzegrep or xzfgrep then egrep(1) or fgrep(1) is used instead of grep(1).  The same applies to names lzgrep, lze-
       grep, and lzfgrep, which are provided for backward compatibility with LZMA Utils.

ENVIRONMENT

       GREP   If the GREP environment variable is set, xzgrep uses it instead of grep(1), egrep(1), or fgrep(1).

SEE ALSO

       grep(1), xz(1), gzip(1), bzip2(1), zgrep(1)

Tukaani 							    2010-09-27								 XZGREP(1)
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