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My REGExp Template With Double "@" Email

Hi, who just came.

I am learning RegExp JavaScript rules. And I wrote an email validation template. But unfortunately, this allows double "@" in the examples.

Please help me improve it.

^(?:\s|(?:[az]))(?:[a-zA-Z0-9]+.) +@ (?:[a-zA-Z])+.[az]+\s+

A screenshot is also available: enter image description here

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4 answers

The reason your regex allows the second @ character . :

 ^(?:\s|(?:[az]))(?:[a-zA-Z0-9]+.) +@ (?:[a-zA-Z])+.[az]+\s+ ^

Allows the use of any character. Just avoid it with \. to make it just a point.

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There is a standard RFC 5322 with a true complex regular expression

  (?:[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])? | \[(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3} (?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?|[a-z0-9-]*[a-z0-9]: (?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21-\x5a\x53-\x7f] | \\[\x01-\x09\x0b\x0c\x0e-\x7f])+) \])

however this is not a true practical implementation, the most used standard is RFC 5322 matching of about 99.99% of all email addresses that are used today.

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

For a more accurate regular expression, you can also select filtering on the upper lvl domains for the regular expression, however, you will need to update this regular expression every time a new domain is added, since the upper lvl domains that are no longer used are now almost inaccessible

 [a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*@ (?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+(?:[AZ]{2}|com|org|net|edu|gov|mil| biz|info|mobi|name|aero|asia|jobs|museum)\b
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Your regular expression seems more complex than necessary. You can use this regex:

 /^\s*[az][\w.] +@ [\w-]+(?:\.[az]+)+\s*$/gmi

RegEx Demo

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  /^[a-zA-Z0-9._-] +@ [az]+.[az.]{2,5}$/

You can try this simple regex See https://referencekiru.wordpress.com/2015/05/28/regular-expressions/

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