url method

FormFieldValidator url ({String errorText: "This field requires a valid email address." })

FormFieldValidator that requires the field's value to be a valid url.

Implementation

static FormFieldValidator url({
  String errorText = "This field requires a valid email address.",
}) {
  return (val) {
    if (val != null && val.isNotEmpty) {
      Pattern pattern =
          r"(https?|ftp)://([-A-Z0-9.]+)(/[-A-Z0-9+&@#/%=~_|!:,.;]*)?(\?[A-Z0-9+&@#/%=~_|!:‌​,.;]*)?";
      if (!RegExp(pattern).hasMatch(val)) return errorText;
    }
  };
}