emailValidation function
Implementation
bool emailValidation(String? value) {
if (value == null || value.isEmpty) return false;
const emailRegex =
r'^(([^<>()[\]\\.,;:\s@"]+(\.[^<>()[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$';
return RegExp(emailRegex).hasMatch(value);
}