Hi choroba ... sorry for the confusion with the post. below is what I am doing. 
foo_bar_foo10.1.1.1.foo10.1.1.1.txt
foo_bar_foo10.1.1.1.foo10.1.1.1.FOO-1.txt
foo_bar_foo10.1.1.1.foo10.1.1.1.test_FOO1.txt
foo_bar_foo10.1.1.1.foo10.1.1.1.test_FOO_abc_mon.txt

[download]

Above are the files which I need to query with regular expression. Out of which I need to pick only file2, file3, file4

and move them to some other directory. file1 should remain untouched.

Similarly sometime another set of files is as below

foo_foo_foo10.1.1.1.TEST.failed
foo_foo_foo10.1.1.1.test_FOO1.failed

[download]

Out of which I need to pick only file2 and move them to some other directory. file1 should remain untouched.

As of now I have separte regex to filter and picking the desired files with grep -v.

Thanks

In reply to Re^4: Regex lookahead, lookbehind by rahulme81
in thread Regex lookahead, lookbehind by rahulme81

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