CODE EXAMPLE FOR DART

validator in form field flutter

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mixin InputValidationMixin {
  bool isPasswordValid(String password) => password.length == 6;

  bool isEmailValid(String email) {
    Pattern pattern =
      r '^(([^<>()[].,;:s@"]+(.[^<>()[].,;:s@"]+)*)|(".+"))@(([[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}])|(([a-zA-Z-0-9]+.)+[a-zA-Z]{2,}))$';
    RegExp regex = new RegExp(pattern);
    return regex.hasMatch(email);
  }
}