Should be an easy GREP question...


 
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# 1  
Should be an easy GREP question...

Two things.

1. I need to list all the jpg that start with a specific pattern and I tried using wildcards and can't get it to work. Basically:

Code:
grep "cpd*.jpg" myfile.sgm

return all entries that start with cpd (wildcard) and jpg

but this does not work and I can't find another option--I'm probably thinking of the DOS world.
# 2  
Code:
grep "cpd[[:alnum:]]*\.jpg" myfile.sgm

Or to grep only for pattern starting with cpd
Code:
grep "^cpd[[:alnum:]]*\.jpg" file

Or
Code:
grep "^cpd.*\.jpg" file


Last edited by Yoda; 02-14-2013 at 05:34 PM.. Reason: added
# 3  
Yes, the '?*[]' meta-character pattern system for file globbing and case statements is not to be confused with the regex() regular expression system used in grep/sed/vi/vim/awk/perl where ? is now ., * is now .*, and the square braces can also do not-in-set [^0-9]. Even regex come in variations, the extended egrep set being a bit different from the basics, and many tools have other extensions. Even the vintage of regex can make meta change, so word boundaries \< and \> become \b: Regex Tutorial - \b Word Boundaries
# 4  
Quote:
Originally Posted by jcor826
Two things.

1. I need to list all the jpg that start with a specific pattern and I tried using wildcards and can't get it to work. Basically:

Code:
grep "cpd*.jpg" myfile.sgm

return all entries that start with cpd (wildcard) and jpg

but this does not work and I can't find another option--I'm probably thinking of the DOS world.
Correct, * does not mean what you think it does to grep.

It means "zero or more of the previous character". So cpd.jpg, cpdd.jpg, cpdddddddd.jpg, etc.

Also, . is special. It means 'any character'. If you want an actual dot, that's \.

So the regex you want is cpd.*\.jpg
# 5  
Then there is the SQL metaset for like, and on and on . . . .
 

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