flutter text form field email validation
String validateEmail(String value) {
Pattern pattern =
r"^[a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]"
r"{0,253}[a-zA-Z0-9])?(?:.[a-zA-Z0-9](?:[a-zA-Z0-9-]"
r"{0,253}[a-zA-Z0-9])?)*$";
RegExp regex = new RegExp(pattern);
if (!regex.hasMatch(value) || value == null)
return 'Enter a valid email address';
else
return null;
}create a validator in flutter
TextFormField(
// The validator receives the text that the user has entered.
validator: (value) {
if (value.isEmpty) {
return 'Please enter some text';
}
return null;
},
);create a validator in flutter
ElevatedButton(
onPressed: () {
// Validate returns true if the form is valid, otherwise false.
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.
Scaffold
.of(context)
.showSnackBar(SnackBar(content: Text('Processing Data')));
}
},
child: Text('Submit'),
);validator flutter
final passwordValidator = MultiValidator([
RequiredValidator(errorText: 'password is required'),
MinLengthValidator(8, errorText: 'password must be at least 8 digits long'),
PatternValidator(r'(?=.*?[#?!@$%^&*-])', errorText: 'passwords must have at least one special character')
]);
String password;
Form(
key: _formKey,
child: Column(children: [
TextFormField(
obscureText: true,
onChanged: (val) => password = val,
// assign the the multi validator to the TextFormField validator
validator: passwordValidator,
),
// using the match validator to confirm password
TextFormField(
validator: (val) => MatchValidator(errorText: 'passwords do not match').validateMatch(val, password),
)
]),
);Copyright © 2021 Codeinu
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