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Full Discussion: regex question using egrep
Top Forums Shell Programming and Scripting regex question using egrep Post 302539659 by mirni on Monday 18th of July 2011 10:30:42 AM
Old 07-18-2011
You can use ? to specify "one or none", but what you really need are anchors:
Code:
echo $DIR | egrep '^[a-z]{6}[0-9]{1,2}$'

Because something like
Code:
echo $DIR | egrep '[a-z]{6}[0-9]{1,2}'

will match 'qwertyuiio01234' also, since it does contain 6 alphas and 1digit:

Last edited by mirni; 07-18-2011 at 11:45 AM..
 

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DGREP(1)						   Debian-goodies documentation 						  DGREP(1)

NAME
dgrep, degrep, dfgrep, dzgrep -- grep through files belonging to an installed Debian package SYNOPSIS
dgrep [most grep options] pattern package... dgrep --help DESCRIPTION
dgrep invokes grep(1) on each file in one or more installed Debian packages. It passes the package argument(s) to dglob(1) to retrieve a list of files in those packages. You can use POSIX regular expressions for the package names. If dgrep is invoked as degrep, dfgrep or dzgrep then egrep(1), fgrep(1) or zgrep(1) is used instead of grep. OPTIONS
dgrep supports most of grep(1)'s options. Please refer to your grep documentation (i.e. the manpage or the texinfo manual) for a complete listing. Only a few options are excluded because they do not conform with the intended behaviour, see the list below. Options of grep that are not supported by dgrep -r, --recursive, -d recurse, --directories=recurse -d read, --directories=read dgrep searches only in the "normal" files of a package. It skips all directories and symlinks. Therefor the options of grep that are specific to directories are not supported. AUTHOR
Matt Zimmerman <mdz@debian.org> This manpage was written by Frank Lichtenheld <frank@lichtenheld.de>. COPYRIGHT AND LICENCE
Copyright (C) 2001 Matt Zimmerman <mdz@debian.org>. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. On Debian systems, a copy of the GNU General Public License may be found in /usr/share/common-licenses/GPL. SEE ALSO
grep(1), egrep(1), fgrep(1), zgrep(1), dglob(1), regex(7), dpkg(8) perl v5.14.2 2012-03-21 DGREP(1)
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