Validate email address in javascript using state machine

Question

I have read lots of questions about email validation in javascript, and never found a really satisfactory solution.

Example: Validate email address in JavaScript?

Problem is, most answers use regex, and the regex required for email is too complex to understand.

I have read that the best way to validate emails, is to use a state machine to match the spec. I can't imagine this is too complex, but can't find any examples online of non-regex email validation in javascript. Are there any out there?

Answer 1

You should stick with ^[^@]+@[^@]+$ ..That's it..

1>Validate the mail with above regex

2>Send mail to that email address.

3>Email Id is valid if you get any response from that Id...

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In case you want to prevent users from making mispells you can use mailcheck.js

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Stop Validating Email Addresses With Complicated Regular Expressions

Highlight:

Think about it this way: I register for your website under the email address qwiufaisjdbvaadsjghb@gmail.com. C'mon. That shit's probably going to bounce off of the illustrious mail daemon, but the formatting is fine; it's a valid email address.