Interesting. So a failed match will clear the $1 variable.
I'm still a little stumped by Marco's original example:
$test = <<'END';
$count = $test =~ s#(XXW?Y)##gi;
print "REMOVED: <<$1>>\nCOUNT: $count\n";
That fails. But remove the "i" in the substitution and $1 is defined. Why would case-insensitive make any difference?
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