I wonder who has THE solution which combines shortness and elegance in a tremendous way
You do realise that it is not always possible to reconcile these two aims?
A single "one size fits all" test will not give you the chance of reporting why the password is no good. If this is not a problem, then my best shot looks like:
#! /usr/local/bin/perl -w
use strict;
while( <DATA> ) {
chomp;
my $ok = (
length $_ >= 5
and length $_ <=8
and /\d/
and /[A-Z]/
and /[a-z]/
);
print sprintf('%-12s', $_), ($ok ? 'valid' : 'invalid '), "\n";
}
I would probably break it up into separate test as shown elsewhere in this thread. You might also want to avoid reinventing the wheel and look at Data::Password::BasicCheck. Also, given that most people never bother to change the password they are given, you should also investigate Crypt::GeneratePassword.
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