Electronic mail, or email, is a method of exchanging digital messages between people using digital devices such as computers, mobile phones and other electronics. Email first entered substantial use in the 1960s and by the mid-1970s had taken the form now recognized as email. Email operates across computer networks, which today is primarily the Internet.
Write a function witch help you to verify if a string given is a mail address or not, true if you want to say yes it's a mail, and false if not a mail address.
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problem in ur test case 2 & 4
The test suite has problems according to RFC 3969 (https://www.rfc-editor.org/rfc/inline-errata/rfc3696.html): there should not be spaces in a domain address, nor can it be made with numbers only. When building a problem of such type, it is best to specify which RFC that you are using as a reference, or if its rules are made up (which should be described).
Case 2 is actually correct, because e-mails cannot be longer than 254 or 256 characters. But case 4 is not, and goes against case 16: both should be true or both should be false (to be consistent at the very least since there cannot be spaces at domains). And as I mentioned, case 14 also goes against the rules for valid e-mail addresses by having a real number as a domain.
Cases 4 and 14 now have a correct_answer of false, per the explanation by Rafael S.T. Vieira.
You should really add some unusual email addresses like "@"@example.com or "\""@example.com or root@[127.0.0.1] to the test suite!