rfc 5322 official standard email regex

email_ regex.dart

// The Official Standard: RFC 5322 
final emailRegexp = RegExp(
    r"^[a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,253}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,253}[a-zA-Z0-9])?)*$");

void main() {
  [
    'alex.v@gmail.com',
    'v@gmail.com',
    'v@3.gmail.com',
    '@3.gmail.com',
    '3.gmail.com',
    'v@',
  ].forEach(checkEmail);
}

checkEmail(String email) {
  final checkSimbol = emailRegexp.hasMatch(email) ? '\u{2705}' : '\u{274C}';
  print('$checkSimbol - $email');
}