What is the best way to check the strength of a password?

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Depending on the language, I usually use regular expressions to check if it has:

  • At least one uppercase and one
    lowercase letter
  • At least one number
  • At least one special character
  • A length of at least six characters

You can require all of the above, or use a strength meter type of script. For my strength meter, if the password has the right length, it is evaluated as follows:

  • One condition met: weak password
  • Two conditions met: medium password
  • All conditions met: strong password

You can adjust the above to meet your needs.

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