validateName method
Implementation
String? Function(String?) validateName(String? value,
{String? requiredError, String? invalidError}) {
return (String? value) {
if (value == null || value.isEmpty) {
return requiredError ?? 'Please enter a name';
}
// Regular expression to validate name format
final nameRegex = RegExp(r'^[a-zA-Z ]+$');
if (!nameRegex.hasMatch(value)) {
return invalidError ?? 'Please enter a valid name';
}
return null; // Return null to indicate valid input
};
}