in reply to Re^8: Filter and writing error log file
in thread Filter and writing error log file

No. [^A{4}|^T{4}] is equivalent to [^^AT}|{4], i.e. it matches anything except ^, A, T, verbar, curlies and four.
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Re^10: Filter and writing error log file
by newtoperlprog (Sexton) on Jul 24, 2014 at 19:00 UTC

    Dear Choroba, thank you for your reply.

    I am getting a little bit confused here. As '^' matches the beginning of the character and in my filter criteria position 15-19 should have atleast 3 A's or 3 T's not necessarily starts with A or T but it could be something like like:

    15-AATAG-19 15-ATAAC-19 15-TTTAC-19 15-GCAAA-19 15-GATAA-19

    Sorry for so many posts, but I really want to understand.

    Thankyou