> need to use printf

Why do you need it?

Also, don't open the output file in each iteration of the loop. Just open it once before the loop starts.

Moreover, $_ and "$_" makes no difference in this case. Drop the useless quotes.

($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord
}map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,

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In reply to Re^3: match digit, followed by hyphen, followed again by digit - then add whitespaces and replace in file by choroba
in thread match digit, followed by hyphen, followed again by digit - then add whitespaces and replace in file by fasoli

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