In our password strength function, we will require that a password pass three different validations. First, it must meet a specific length. In our case, we are requiring that a password is at least eight characters. Then, we check to be sure that we have a fair amount of unique characters being used. A password that uses the same few characters repeatedly is not secure. Finally, we validate that there are a combination of numbers and letters and that at least one number has a letter on either side of it.
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