regular expression...help!!

andy2000 · #1 (**permalink**) 07-18-2007

how to list all text files except the files from 20070712:

abc_20070710_123.txt
abc_20070711_123.txt
abc_20070712_123.txt

ls *.txt | egrep"[a-z]+_^20070710_[0-9]+\.txt"

Any idea please!!

Andy

kamitsin · #2 (**permalink**) 07-18-2007

Code:

ls *.txt|grep -v 20070712

andy2000 · #3 (**permalink**) 07-18-2007

kamitsin, how to solve the problem in "regular expression" not with grep -v ???

lorcan · #4 (**permalink**) 07-18-2007

Do you want an exact pattern that matches the files like "abc_20070710_123.txt" ?

Or do you want to use sed instead of grep -v

Code:

ls *.txt | sed '/20070712/d'

andy2000 · #5 (**permalink**) 07-18-2007

lorcan,

>Do you want an exact pattern that matches the files like "abc_20070710_123.txt" ?

yes that what I need.

Thank you

Andy

lorcan · #6 (**permalink**) 07-18-2007

Note this is just the pattern you have asked for. And if you do not want to list the files with the pattern "20070712" you have to follow either the two methods mentioned above.

Hope this helps

Pattern

Code:

^abc_[0-9]\{8\}_[0-9]\{3\}\.txt$

or to generalize

Code:

^[a-z]\{3\}_[0-9]\{8\}_[0-9]\{3\}\.txt$

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