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Full Discussion: Pattern Matching Syntax
Top Forums Shell Programming and Scripting Pattern Matching Syntax Post 302437060 by fubaya on Tuesday 13th of July 2010 11:53:59 PM
Old 07-14-2010
Code:
tr '_' ' ' | egrep -w -o [A-Z]{4}[0-9]{4}

Almost one command but I had to use tr first to get rid of the underscore because it's seen as part of the word in the first line. Darn. What it does is grep the line for a word that consists of capital letters (4) and numbers (4). -o displays only the match and not the whole line.

test:
Code:
# echo 'Title_Title2_Title3_ABCD0123_Title4.doc
Title title2 DEFG5678 Title3 Title4.doc
XYZA1234-Title.doc
extra testing lines:
1234
abcd1234
abcd123
abc1234
1234abcd
1234ABCD' | tr '_' ' ' | egrep -w -o [A-Z]{4}[0-9]{4}
ABCD0123
DEFG5678
XYZA1234
#

It didn't grep "abcd1234" because it's not capital letters. If you need case insensitive, change the [A-Z] to [aA-zZ]
 

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LEARN ABOUT X11R4

zgrep

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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