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Full Discussion: sed - using regex and | need help
Top Forums Shell Programming and Scripting sed - using regex and | need help Post 302271444 by TehOne on Thursday 25th of December 2008 04:56:14 PM
Old 12-25-2008
Question sed - using regex and | need help
From my understanding when using regex1|regex2 the matching process tries each alternative in turn, from left to right, and the first one that succeeds is used.
When im trying to extract the name from those examples:

A) name.can.be.different.20.03.2009.boom
B) name.can.be.different.20.03.09.boom
C) name_can_be_different_2009_boom

by using:

Code:
sed 's/\(.*\)[._]\([0-9][0-9].[0-9][0-9].[0-9][0-9][0-9][0-9]\|[0-9][0-9].[0-9][0-9].[0-9][0-9]\|[0-9][0-9][0-9][0-9]\)[._]\(.*\)/\1/'

It gives:

A) name.can.be.different.20.03 (WRONG)
B) name.can.be.different (GOOD)
C) name_can_be_different (GOOD)

Why does it fail on A) ? By my order of regex pattern it's suppose to match on
[0-9][0-9].[0-9][0-9].[0-9][0-9][0-9][0-9] but it doesn't ?
 

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LEARN ABOUT DEBIAN

actdiag

ACTDIAG(1)						      General Commands Manual							ACTDIAG(1)

NAME

       actdiag - generate activity-diagram image file from spec-text file.

SYNOPSIS

       actdiag [options] files

DESCRIPTION

       This manual page documents briefly the actdiag commands.

       actdiag is a program that generate activity-diagram image file from spec-text file.

OPTIONS

       These  programs	follow	the  usual  GNU  command  line	syntax, with long options starting with two dashes (`-').  A summary of options is
       included below.	For a complete description, see the Info files.

       -h, --help
	      show this help message and exit

       -a, --antialias
	      Pass diagram image to anti-alias filter

       -c FILE, --config=FILE
	      read configurations from FILE

       -o FILE
	      write diagram to FILE

       -f FONT, --font=FONT
	      use FONT to draw diagram

       -s, ----separate
	      Separate diagram images for each group (SVG only)

       -T TYPE
	      Output diagram as TYPE format

SEE ALSO

       The programs are documented fully by
       http://tk0miya.bitbucket.org/actdiag/build/html/index.html

AUTHOR

       actdiag was written by Takeshi Komiya <i.tkomiya@gmail.com>

       This manual page was written by Kouhei Maeda <mkouhei@palmtb.net>, for the Debian project (and may be used by others).

								   June  5, 2011							ACTDIAG(1)
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