Question 273477 in Flutter Question posted in
The official Flutter documentation can be found here.

Flutter How can I validate only 'https' and reject 'http' using form_field_validator?

I am trying to make a validation for URL which is accept only ‘https’ and reject ‘http’. I am using form_field_validator for it and I probably understand how to use it. However, I have no idea how to write the regex. Could anyone help me to solve this? This is the code down below.

url_validator.dart

import 'package:form_field_validator/form_field_validator.dart';

class UrlValidator extends TextFieldValidator {
  UrlValidator({required String errorText}) : super(errorText);

  // I would like to validate only 'https' but this code doesn't work
  var urlPattern =
      r'https';

  @override
  bool isValid(String? value) => RegExp(urlPattern).hasMatch(value!);
}

validators.dart

import 'package:form_field_validator/form_field_validator.dart';

final urlValidator = MultiValidator([
  UrlValidator(errorText: 'URL is invalid'),
]);
Tags:

2

Answers


  1. 0

    Try this regex hope this will work.

    final RegExp httpsPattern = RegExp(r'^https://');
    Login or Signup to reply.
  2. 0

    You can use a regular expression to validate URLs in Flutter using the form_field_validator package. To accept only "https" URLs and reject "http" URLs, you can use the following regular expression pattern and a RegExp validator:

    RegExp regex = RegExp(r'^https://[a-zA-Z0-9.-]+.[a-zA-Z]{2,}$');

    Login or Signup to reply.
Please signup or login to give your own answer.

Back To Top
Search