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Yes, the regex is not selective enough. Apologies for the miss. I have to add starting with < or > to the above regex.

Thanks RudyC for the explanation. The pattern will be [digit]{1,}[acd][digit]{1,} i.e atleast one digit followed by any one of the characters a,c,d and followed by one or more digits.

Thanks

Thank you raja and RudiC.

These solutions seems to work for most of the test-cases. Haven't had much experience with awk. Please let me know ,if I understand correctly these solutions

Raja,...

Hi,
I have two files file1.txt and file2.txt. Please see the attachments.

In file2.txt (which actually is a diff output between two versions of file1.txt.), I extract the pattern corresponding to...