JAVASCRIPT

Validating Password Strength with Multiple Regex Criteria

Enforce strong passwords by combining multiple regular expressions to check for minimum length, uppercase, lowercase, numbers, and special characters.

function checkPasswordStrength(password) {
  const minLength = 8;
  const hasUpperCase = /[A-Z]/;
  const hasLowerCase = /[a-z]/;
  const hasNumber = /[0-9]/;
  const hasSpecialChar = /[!@#$%^&*()_+\-=\[\]{};':"\\|,.<>\/?]/;

  let strength = {
    length: password.length >= minLength,
    upper: hasUpperCase.test(password),
    lower: hasLowerCase.test(password),
    number: hasNumber.test(password),
    special: hasSpecialChar.test(password)
  };

  return {
    isValid: Object.values(strength).every(Boolean),
    criteria: strength
  };
}

// Examples:
console.log(checkPasswordStrength("Passw0rd!")); 
// { isValid: true, criteria: { length: true, upper: true, lower: true, number: true, special: true } }
console.log(checkPasswordStrength("weakpass"));
// { isValid: false, criteria: { length: true, upper: false, lower: true, number: false, special: false } }

How it works: This snippet checks a password's strength against multiple criteria: minimum length, presence of uppercase letters, lowercase letters, numbers, and special characters. Each criterion is validated using a separate regular expression. The function returns an object indicating overall validity and the status of each individual requirement, useful for providing specific feedback to users.

Validating Password Strength with Multiple Regex Criteria

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