email static method
Implementation
static FormFieldValidator<String> email(String errorMessage) {
return (value) {
if (value!.isEmpty)
return null;
else {
final emailRegex = RegExp(
r"^[a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,253}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,253}[a-zA-Z0-9])?)*$");
if (emailRegex.hasMatch(value))
return null;
else
return errorMessage;
}
};
}