Java regex email

Question

First of all, I know that using regex for email is not recommended but I gotta test this out.

I have this regex:

\\b[A-Z0-9._%-]+@[A-Z0-9.-]+\\.[A-Z]         


        

Answer 1

Don't. You will never end up with a valid expression.

For example these are all valid email addresses:

"Abc\@def"@example.com
"Fred Bloggs"@example.com
"Joe\\Blow"@example.com
"Abc@def"@example.com
customer/department=shipping@examp­ le.com
$A12345@example.com
!def!xyz%abc@example.com
_somename@example.com
matteo(this is a comment).corti@example.com
root@[127.0.0.1]

Just to mention a few problems:

• you don't consider the many forms of specifying a host (e.g, by the IP address)
• you miss valid characters
• you miss non ASCII domain names

Before even beginning check the corresponding RFCs