isStringValidPassword function

bool isStringValidPassword(String password, { PasswordComplexity complexity = PasswordComplexity.eightChar1Letter1Number, })

Validates a password against the specified complexity requirements.

password The password string to validate. complexity The complexity preset to validate against. Defaults to PasswordComplexity.eightChar1Letter1Number.

Returns true if the password meets the complexity requirements.

Implementation

bool isStringValidPassword(
  String password, {
  PasswordComplexity complexity = PasswordComplexity.eightChar1Letter1Number,
}) {
  switch (complexity) {
    case PasswordComplexity.sixCharAnything:
      // Minimum 6 characters, any characters allowed
      return password.length >= 6;

    case PasswordComplexity.eightChar1Letter1Number:
      // Minimum 8 characters, at least one letter and one number
      final regex = RegExp(r'^(?=.*[a-zA-Z])(?=.*\d).{8,}$');
      return regex.hasMatch(password);

    case PasswordComplexity.eight2Upper2Number2Special:
      // Minimum 8 characters, at least 2 uppercase, 2 numbers, 2 special chars
      if (password.length < 8) return false;

      final uppercaseCount = RegExp(r'[A-Z]').allMatches(password).length;
      final numberCount = RegExp(r'\d').allMatches(password).length;
      final specialCount =
          RegExp(r'[!@#$%^&*()_+\-=\[\]{};:"\\|,.<>\/?]').allMatches(password).length;

      return uppercaseCount >= 2 && numberCount >= 2 && specialCount >= 2;
  }
}