Hi thanos1983, Thanks for your help. Yes part of my questions were answered in that post but I still have other questions relating to resolving the entire problem. In the example program I provided I am trying to trigger the scenario were two lines are found to exist in an input file, in this case the lines CFU-TS10-ACT and CFB-TS10-ACT. If I change the if statement to the following then this works fine as would be expected 
if (/\t*CF=(CFU-TS10-ACT-(NONE|\d+))/)

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But I do not know how to check for the existence of two lines.

In reply to Re^2: Check multiple lines exist in a record by gbwien
in thread Check multiple lines exist in a record by gbwien

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