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Full Discussion: Repeated Pattern
Top Forums Shell Programming and Scripting Repeated Pattern Post 302452599 by Aia on Saturday 11th of September 2010 07:21:14 PM
Old 09-11-2010
Quote:
Originally Posted by bartus11
Code:
egrep '.(.).\1' file

If it is truly the first and fourth character what you are seeking, then
Code:
grep -E '^.(.).\1' file

since it does not match the pattern in any other part of the length of the string.

If you are looking for the said pattern in any word, regardless of the length of it.
Code:
grep -E '\<.(.).\1' file

If you want to limit the pattern to words of four characters length.
Code:
grep -E '\<.(.).\1\>' file

 

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ZGREP(1)                                                      General Commands Manual                                                     ZGREP(1)

NAME
zgrep - search possibly compressed files for a regular expression SYNOPSIS
zgrep [ grep_options ] [ -e ] pattern filename... DESCRIPTION
Zgrep invokes grep on compressed or gzipped files. These grep options will cause zgrep to terminate with an error code: (-[drRzZ]|--di*|--exc*|--inc*|--rec*|--nu*). All other options specified are passed directly to grep. If no file is specified, then the standard input is decompressed if necessary and fed to grep. Otherwise the given files are uncompressed if necessary and fed to grep. If the GREP environment variable is set, zgrep uses it as the grep program to be invoked. EXIT CODE
2 - An option that is not supported was specified. AUTHOR
Charles Levert (charles@comm.polymtl.ca) SEE ALSO
grep(1), gzexe(1), gzip(1), zdiff(1), zforce(1), zmore(1), znew(1) ZGREP(1)
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