Can someone tell me the mistake I am doing here?

Unlikely, because it isn't self-contained. You are reading 1 set of input from the INPUT_FILE handle (which I'm guessing corresponds to the sample input you have provided) and 2 other sets of input from the REPLAY_FILE handle which have not been provided to us. Without an SSCCE, the my best guess is that you don't really want a regex match at if ($rpl_sub =~ /^$line/) but rather a substring match.

See the Basic Debugging Checklist for how you can help yourself. Good luck.

In reply to Re: Trying to read print in a loop inside a subroutine by hippo
in thread Trying to read print in a loop inside a subroutine by kaushik9918

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