I find this quite confusing as well.
Update: No this makes perfect sense. Thanks to dio for straightening me out.
$rx = qr{ (.) (??{ print $1 }) }x;
print "!" if "japhy" =~ $rx;
__END__
japhy
How does $1 end up being 'japhy' with this re? Interestingly, changing it to
$rx = qr{ (.) (??{ print $1; '' }) }x;
print "!" if "japhy" =~ $rx;
__END__
j!
makes things work out properly.
---
$world=~s/war/peace/g
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