Turn your while into a s///eg 

$file =~ s{^\s+description\s\K(\w{4})(-\w+-\w+)(?:=;)}{ 
    my $prefix = $1;
    my $suffix = $2;

    # Optional Transformation logic here, giving $prefix and $suffix n
+ew values.
    
    $prefix.$suffix
}mge;

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In reply to Re: Problems with matching? by wind
in thread Problems with matching? by Argel

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