How to validate an email address

Please help me write a programme to determine if a string is a valid email address.

defining a valid email address as [e-mail] where "name" can contain the characters a-z, A-Z, 0-9, _, and . (dot). And "domain" can contain the characters a-z, and -. "name" and "domain" must be non-empty. "tld" can be "com", "org", or "net".

Aim is to return true if valid, otherwise false

Answer 1

[pratik gautam]

  user_entry = "[e-mail]";
        control = regexp(user_entry,'[a-z_]+@[a-z]+\.(com|net)')
        if(numel(control)==1)
            aa="worked"
        else
            aa="failed"
        end

here you go, hope it might help someone else

Answer 2

[rwanda mc]

The fully RFC 822 compliant regex is inefficient and obscure for validate email address because of its length. Fortunately, RFC 822 was superseded twice and the current specification for email addresses is RFC 5322. RFC 5322 leads to a regex that can be understood if studied for a few minutes and is efficient enough for actual use.

If you use HTML5, use this code:

<input type="email" name="email" required placeholder="Enter a valid email address">