Validation for special characters

[luizeduardofs]

Is your feature request related to a problem? Please describe.

Validation for passwords and other fields that require special characters is an increasing need in many authentication and security systems. Currently, Vania Dart does not provide a direct way to validate if a field contains specific special characters (like @, $, %, etc.), which makes it difficult to implement stronger security requirements. This has caused frustration when trying to validate passwords and user data that require this feature efficiently.

Describe the solution you'd like

I would like Vania Dart to add a dedicated validation rule for special characters. This would allow developers to easily validate passwords and other fields that require one or more special characters, without the need to manually use regular expressions. A native solution, such as a pattern validation or a special_characters rule, would be ideal.

Describe alternatives you've considered

An alternative that has been used is implementing manual validation through regular expressions, such as using pattern:(?=.[@$!%#?&]) to validate passwords with special characters. While this works, creating a native validation rule in Vania Dart would be a cleaner and more practical approach, without the need for regex in every case.

Additional context

Adding a special character validation directly to Vania Dart would help improve application security and developer experience, enabling the implementation of stricter rules in a simple and hassle-free way.

[javad-zobeidi]

@luizeduardofs

Please update to version 0.8.0. You can use RegExp as follows:

req.validate({
  'username': r'reg_exp:^[a-zA-Z]+$',
});

Alternatively, you can create a custom rule:

*Note: the ruleName must be in lowercase

req.setCustomRule([
  CustomValidationRule(
    ruleName: 'unique_user',
    message: 'User already exists',
    fn: (Map<String, dynamic> data, dynamic value, String? arguments) {
      return true;
    },
  ),
]).validate({
  'username': 'unique_user',
});