isEmailValid method
Email validator
Implementation
bool isEmailValid(String email) {
bool isEmailValid = RegExp(
r"^[a-zA-Z0-9.a-zA-Z0-9.!#$%&'*+-/=?^_`{|}~]+@[a-zA-Z0-9]+\.[a-zA-Z]+")
.hasMatch(email); //This variable returns true if email is valid
//and false if email is not valid
return isEmailValid;
}