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help needd: grouping only brackets not working in linux

Posted: Fri Aug 10, 2007 1:43 am
by dev_net
hi everyone. I am facing strange problem. I am using brackets for grouping only purposes i.e (?: ). But it does not seem to work on linux. I am using Fedora core 4. Thanks in advance.

Posted: Fri Aug 10, 2007 2:23 am
by feyd
Code? Pattern? Doctor?

Posted: Fri Aug 10, 2007 2:38 am
by dev_net
what is doctor? As far as pattern and expression is concern; the situation is same. Grouping brackets are not working. :(
even a simple thing like this does not match any line in a text file

egrep '(?: )' test.txt

Posted: Fri Aug 10, 2007 3:28 am
by stereofrog
Try -P option.