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

Test 
TEXT-A, TEXT-B, TEXT-C