isValidEmail static method
Check if a String is a valid email
Implementation
static bool isValidEmail(String value) {
bool valid = RegExp(
r"^[a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,253}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,253}[a-zA-Z0-9])?)*$")
.hasMatch(value);
return valid;
}