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use warnings;
use strict;
...
    ( add_incr_suffix =~ /^prefix-*/p ? ${^POSTMATCH} : '' ) . "," .
    ( add_incr_suffix =~ /^prefix-*/p ? ${^POSTMATCH} : '' ) . "," .
    ( add_incr_suffix =~ /^prefix-*/p ? ${^POSTMATCH} : '' ) . "\n";