Hey Discipulus sorry to bother you once again, but when I run code written by you. I got output: 
perl discipulus.pl
checking 'invalid.txt'
        found:'z2=0.7'
checking 'valid.txt'
        found:'some_t2=0.7'

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can you please see to it one more time? Yes, I know I need to practice perl a lot and I am going to do it (help me with this)

In reply to Re^4: filter the files in a folder on the basis of some variable present in them by reciter
in thread filter the files in a folder on the basis of some variable present in them by reciter

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