Happened to me just a few hours ago :)

That really ought to be a warning, I can't imagine a use case where you want the bitwise negation of the number of substitutions  $foo = ~s/// or matches  $foo = ~m//

every time I've encountered this in the past, its always been a mistake

warnings should issue a specific warning

In reply to Re^3: Use of uninitialized value in substitution (s///) by Anonymous Monk
in thread Use of uninitialized value in substitution (s///) by AvanTTix

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