src/js/plugins/password-strength-meter/password-strength-meter.js
function calculateScore(password) {
      var score = 0

      // password < options.minimumLength
      if (password.length < options.minimumLength) {
        return -1
      }

      // password length
      score += password.length * 4
      score += checkRepetition(1, password).length - password.length
      score += checkRepetition(2, password).length - password.length
      score += checkRepetition(3, password).length - password.length
      score += checkRepetition(4, password).length - password.length

      // password has 3 numbers
      if (password.match(/(.*[0-9].*[0-9].*[0-9])/)) {
        score += 5
      }

      // password has at least 2 sybols
      var symbols = '.*[!,@,#,$,%,^,&,*,?,_,~]'
      symbols = new RegExp('(' + symbols + symbols + ')')
      if (password.match(symbols)) {
        score += 5
      }

      // password has Upper and Lower chars
      if (password.match(/([a-z].*[A-Z])|([A-Z].*[a-z])/)) {
        score += 10
      }

      // password has number and chars
      if (password.match(/([a-zA-Z])/) && password.match(/([0-9])/)) {
        score += 15
      }

      // password has number and symbol
      if (
        password.match(/([!,@,#,$,%,^,&,*,?,_,~])/) &&
        password.match(/([0-9])/)
      ) {
        score += 15
      }

      // password has char and symbol
      if (
        password.match(/([!,@,#,$,%,^,&,*,?,_,~])/) &&
        password.match(/([a-zA-Z])/)
      ) {
        score += 15
      }

      // password is just numbers or chars
      if (password.match(/^\w+$/) || password.match(/^\d+$/)) {
        score -= 10
      }

      if (score > 100) {
        score = 100
      }

      if (score < 0) {
        score = 0
      }

      return score
    }
function calculateScore(password) {
      var score = 0

      // password < options.minimumLength
      if (password.length < options.minimumLength) {
        return -1
      }

      // password length
      score += password.length * 4
      score += checkRepetition(1, password).length - password.length
      score += checkRepetition(2, password).length - password.length
      score += checkRepetition(3, password).length - password.length
      score += checkRepetition(4, password).length - password.length

      // password has 3 numbers
      if (password.match(/(.*[0-9].*[0-9].*[0-9])/)) {
        score += 5
      }

      // password has at least 2 sybols
      var symbols = '.*[!,@,#,$,%,^,&,*,?,_,~]'
      symbols = new RegExp('(' + symbols + symbols + ')')
      if (password.match(symbols)) {
        score += 5
      }

      // password has Upper and Lower chars
      if (password.match(/([a-z].*[A-Z])|([A-Z].*[a-z])/)) {
        score += 10
      }

      // password has number and chars
      if (password.match(/([a-zA-Z])/) && password.match(/([0-9])/)) {
        score += 15
      }

      // password has number and symbol
      if (
        password.match(/([!,@,#,$,%,^,&,*,?,_,~])/) &&
        password.match(/([0-9])/)
      ) {
        score += 15
      }

      // password has char and symbol
      if (
        password.match(/([!,@,#,$,%,^,&,*,?,_,~])/) &&
        password.match(/([a-zA-Z])/)
      ) {
        score += 15
      }

      // password is just numbers or chars
      if (password.match(/^\w+$/) || password.match(/^\d+$/)) {
        score -= 10
      }

      if (score > 100) {
        score = 100
      }

      if (score < 0) {
        score = 0
      }

      return score
    }
Returns a value between -1 and 100 to score
the user's password.

@param  string password The password to be checked.
@return int