On: Some useful regular expressions for programmers

[jameshart]

According to the RFC compliant email regex,

   “\@“@example.com

is a valid email address, which your simplified test would reject.

[linkdd → jameshart]

Exactly.

The worst regex would be:

  /^[a-zA-Z0-9\-_]+@[a-zA-Z0-9\-_]+\.[a-zA-Z0-9\-_]+$/

Because it would invalidates `my-email+custom-inbox@example.com`. And that's a pattern I use to automatically sort incoming mails.

Many websites use such a regex :(