You need to reset the TARGET file pointer for every gene, otherwise you'll be at end-of-file after the first time through the file. Try 

    ...
    seek(TARGET, 0, 0);
    while ($target = <TARGET>) {
        ...

[download]

or read the TARGET data into memory, as you've done with the IF data.

In reply to Re: Simple RegEX text parser by almut
in thread Simple RegEX text parser by I-Box

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