Your question isn't clear but it seems like what you want is something like: 
while(<>) {
    /(\d+) (\d+) (\d+) (\d+).*/ and
        $dna= ($1>0?"a":"") .
              ($2>0?"t":"") .
              ($3>0?"g":"") .
              ($4>0?"c":"");
}

[download]
You can of course replace the >0 with another decision, such as >($1+$2+$3+$4)/10.

In reply to Re: weighting regex patterns by fundflow
in thread weighting regex patterns by MadraghRua

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