regexed_validator

Description:

regexed validator

Validating:

phone
name
postalCode
email
url
currency
ip
date
time
htmlTags
password (strong)
password (medium)
creditCard

For Dart/Flutter developers.
Regexed Validator at pub.dartlang.org
Usage #
Usage is pretty simple just pass a phone, date, email... to its validation method, see the example below
import 'package:regexed_validator/regexed_validator.dart';

main() {
print( validator.email('[email protected]') ); // true

print(validator.url('http://www.nowhere.com?product=28&color=blue')); // true

print(validator.currency('£498.10')); // true

print(validator.ip('67.52.159.38')); // true

print(validator.time('14:34 GMT -5')); // true

print( validator.htmlTags('<strong>Bold</strong>\n'
'<em>Emphazied</em>\n'
'<b>Bold</b>\n'
'<i>Italics</i>\n'
'<span id="foo" class="bar">Some text</span>\n'
'<hr />')
); // true
}
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With Flutter TextField, TextFormField and Form(s) #
There is nothing specific to this package when working with Forms and TextFields, see the example below
TextFormField(
// The validator receives the text that the user has entered, and use regexed_validator to check if it is a valid string.
validator: (value) {
if (!validator.email(value)) {
return 'Please enter a valid email';
}
return null;
},
),
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Here is a complete example, with a Form and an email field:
import 'package:flutter/material.dart';
import 'package:regexed_validator/regexed_validator.dart';

void main() => runApp(const MyApp());

class MyApp extends StatelessWidget {
const MyApp({Key? key}) : super(key: key);

@override
Widget build(BuildContext context) {
const appTitle = 'Form Validation Demo';

return MaterialApp(
title: appTitle,
home: Scaffold(
appBar: AppBar(
title: const Text(appTitle),
),
body: const MyCustomForm(),
),
);
}
}

// Create a Form widget.
class MyCustomForm extends StatefulWidget {
const MyCustomForm({Key? key}) : super(key: key);

@override
MyCustomFormState createState() {
return MyCustomFormState();
}
}

// Create a corresponding State class.
// This class holds data related to the form.
class MyCustomFormState extends State<MyCustomForm> {
// Create a global key that uniquely identifies the Form widget
// and allows validation of the form.
//
// Note: This is a GlobalKey<FormState>,
// not a GlobalKey<MyCustomFormState>.
final _formKey = GlobalKey<FormState>();

@override
Widget build(BuildContext context) {
// Build a Form widget using the _formKey created above.
return Form(
key: _formKey,
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
TextFormField(
// The validator receives the text that the user has entered, and use regexed_validator to check if it is a valid string.
validator: (value) {
if (value == null || !validator.email(value)) {
return 'Please enter a valid email';
}
return null;
},
),
Padding(
padding: const EdgeInsets.symmetric(vertical: 16.0),
child: ElevatedButton(
onPressed: () {
// Validate returns true if the form is valid, or false otherwise.
if (_formKey.currentState!.validate()) {
// If the form is valid, display a snackbar. In the real world,
// you'd often call a server or save the information in a database.
ScaffoldMessenger.of(context).showSnackBar(
const SnackBar(content: Text('Processing Data')),
);
}
},
child: const Text('Submit'),
),
),
],
),
);
}
}
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