Yes, it's certainly OK and this site offers more in ways of refining the question than Stackoverflow. Still, I consider it polite to point out if a question has been asked elsewhere so that people don't spend unnecessary effort on an answer that has already been given elsewhere.

In reply to Re^3: replace a line with lines based on information extracted from these line using Perl by Corion
in thread replace a line with lines based on information extracted from these line using Perl by sajjad

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