in reply to ne vs. ! eq

Precedence. See perlop: ! $s1 eq $s2 is the same as (!$s1) eq $s2, and not !( $s1 eq $s2 ), as B::Deparse will tell you:

$ perl -MO=Deparse,-p -e 'if (! $s1 eq $s2) {}' if (((!$s1) eq $s2)) { (); }

You'll need to write either if ( !( $s1 eq $s2 ) ), if ( not $s1 eq $s2 ), unless ( $s1 eq $s2 ), or of course if ( $s1 ne $s2 ).

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Re^2: ne vs. ! eq
by boerni (Novice) on Feb 25, 2020 at 08:42 UTC
    Thank you very much haukex!