CookingLab/lib/core/utils/validation_functions.dart

/// Password should have,
/// at least a upper case letter
///  at least a lower case letter
///  at least a digit
///  at least a special character [@#$%^&+=]
///  length of at least 4
/// no white space allowed
bool isValidPassword(String? inputString, {bool isRequired = false}) {
  bool isInputStringValid = false;

  if ((inputString == null ? true : inputString.isEmpty) && !isRequired) {
    isInputStringValid = true;
  }

  if (inputString != null) {
    const pattern =
        r'^(?=.*?[A-Z])(?=(.*[a-z]){1,})(?=(.*[\d]){1,})(?=(.*[\W]){1,})(?!.*\s).{8,}$';

    final regExp = RegExp(pattern);

    isInputStringValid = regExp.hasMatch(inputString);
  }

  return isInputStringValid;
}

/// Checks if string consist only Alphabet. (No Whitespace)
bool isText(String? inputString, {bool isRequired = false}) {
  bool isInputStringValid = false;

  if ((inputString == null ? true : inputString.isEmpty) && !isRequired) {
    isInputStringValid = true;
  }

  if (inputString != null) {
    const pattern = r'^[a-zA-Z]+$';

    final regExp = RegExp(pattern);

    isInputStringValid = regExp.hasMatch(inputString);
  }

  return isInputStringValid;
}