checkValidEmail static method
Check if string is a valid email address
email - The email address to validate
Returns true if email is valid
Implementation
static bool checkValidEmail(String email) {
final emailRegex = RegExp(r'^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$');
return emailRegex.hasMatch(email);
}