checkPasswordStrength static method

FSPasswordStrength checkPasswordStrength(String password)

Password strength validation with comprehensive scoring

Evaluates password strength based on length, character variety, and complexity.

Performance: O(n) where n is password length

Example:

final strength = FSValidators.checkPasswordStrength('SecurePass123!');
print(strength.name); // 'Strong'

Implementation

static FSPasswordStrength checkPasswordStrength(String password) {
  if (password.length < 6) return FSPasswordStrength.weak;

  final checks = [
    RegExp(r'[A-Z]').hasMatch(password), // Uppercase letters
    RegExp(r'[a-z]').hasMatch(password), // Lowercase letters
    RegExp(r'[0-9]').hasMatch(password), // Numbers
    RegExp(r'[!@#$%^&*(),.?":{}|<>]').hasMatch(password), // Special chars
    password.length >= 12, // Length bonus
    password.length >= 16, // Extra length bonus
  ];

  final score = checks.where((check) => check).length;

  // Enhanced scoring logic
  if (score >= 5) return FSPasswordStrength.strong;
  if (score >= 3) return FSPasswordStrength.medium;
  return FSPasswordStrength.weak;
}