Out of curiosity, I tried tr/// instead of regex, much faster :)
sub validatetr {
local $_ = shift;
length >= 20 ? 1 :
!tr/a-z// || !tr/A-Z// ? 0 :
length >= 16 ? 1 :
!tr/0-9// ? 0 :
length >= 12 ? 1 :
!tr/a-zA-Z0-9//c ? 0 :
length >= 8 ? 1 :
0;
}
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