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It has nothing specifically to do with POSTMATCH, you just ran into the multi-concatenation optimization.

#!/usr/bin/perl use strict; # https://perlmonks.org/?node_id=11118049 use warnings; use v5.10; sub add_incr_suffix { state $suffix = 'A'; return "prefix-TEXT-" . $suffix++; } print 'Test ' . ( add_incr_suffix =~ /^prefix-*/p ? "${^POSTMATCH}" : '' ) . "," . ( add_incr_suffix =~ /^prefix-*/p ? "${^POSTMATCH}" : '' ) . "," . ( add_incr_suffix =~ /^prefix-*/p ? "${^POSTMATCH}" : '' ) . "\n";

Here is a simpler example that produces different output under 5.26 and 5.30

#!/usr/bin/perl use strict; # https://perlmonks.org/?node_id=11118049 use warnings; my $foo; print "test: " . ($foo = 1) . ($foo = 2) . ($foo = 3), "\n";

In reply to Re: ${^POSTMATCH} problem by tybalt89
in thread ${^POSTMATCH} problem by pl_pm

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