Question

I need to find everything in a string that is not an e-mail address.

Here is my version of how to find an e-mail address.

^[a-zA-Z0-9_.-]+@[a-zA-Z0-9][a-zA-Z0-9-.]+\.([a-zA-Z]{2,6})$

I want to modify this regex to find the inverse–everything other than the e-mail address in any string.

---

###Example 1:
asdasd

###Example 2:
[e-mail] sda

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Note: I want to get status == true in the following line:

var status = myString.match(pattern matches everything that is not an email address);

###I can only change the pattern, nothing else!

Answer 1

The official standard is known as RFC 2822. Regex pattern for email address is then:

(?:[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*|"(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21\x23-\x5b\x5d-\x7f]|\\[\x01-\x09\x0b\x0c\x0e-\x7f])*")@(?:(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?|\[(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?|[a-z0-9-]*[a-z0-9]:(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21-\x5a\x53-\x7f]|\\[\x01-\x09\x0b\x0c\x0e-\x7f])+)\])

More practical implementation of RFC 2822 (if we omit the syntax using double quotes and square brackets), which will still match 99.99% of all email addresses in actual use today, is:

[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?

To get list of non-matching "words" from myString use JavaScript code:

var status = myString.match(/(?:\s|^)(?![a-z0-9!#$%&'*+\/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+\/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?)\S+\b(?=\s|$)/ig);

Check this demo.