Validate email adresses

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I've just found this nice function that helps you validate the emai adresses that the users give you.

Code:

<?php
function valid_email($email) {
  $regexp="/^[a-z0-9]+([_\\.-][a-z0-9]+)*@([a-z0-9]+([\.-][a-z0-9]+)*)+\\.[a-z]{2,}$/i";
  if ( !preg_match($regexp, $email) ) {

       return false;
  }
  return true;
} 
?>

Just use a code like this to validate the mail adress that the user gave you :

Code:

<?php

if ( valid_email ( $mail ) )
{
     mai ( .............. );
}
else
{
     echo 'The mail adress ' . $mail . ' is not valid. Try another one ';
}
?>

I find that javascript is easier, but I am forced to use PHP because some people dont have JS enabled.

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You will be suprised how many times I disable JS and forms let me enter what I like... it is always a good idea to have server-side check in addition or instead of client-side.

You will be suprised how many times I disable JS and forms let me enter what I like... it is always a good idea to have server-side check in addition or instead of client-side.

I agree. With server side scripting you'll never worry what software your visitor uses

 $regexp="/^[a-z0-9]+([_\\.-][a-z0-9]+)*@([a-z0-9]+([\.-][a-z0-9]+)*)+\\.[a-z]{2,}$/i";
 $regexp="/^[a-z0-9]+([_\\.-][a-z0-9]+)*@([a-z0-9]+([\.-][a-z0-9]+)*){2,}\\.[a-z]{2,}$/i";

Is a one letter 2nd level domain legal?

Can anyone give an example of a one letter 2nd level domain?

I can find www.7T.NET (2 letters in the 2nd level).
and
www.JP.TO (two letters in the second level).

Is there anything like a "c.cc" domain?

If all 2nd levels are at lease 2 letters, wouldn't the second example in the above quote (with blue {2,} 2 or more letters) be better than the first (with red + 1 or more letters)?

I don't know all the domain rules, just never saw a single letter 2nd level domain.

Any comment?

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I know of 2 letter domains (eg. in.gr) but I am not sure for 1 letter. Maybe that's not possible, but you never know as there are so many top level domains.

I know of 2 letter domains (eg. in.gr) but I am not sure for 1 letter. Maybe that's not possible, but you never know as there are so many top level domains.

100% Correct! This morning I thought they were all at least 2 letters.  But received a message today that i.tv is working and all single letter .tv domains are "available".  (There may be more tLds too!)

Anyway, nice function, I added it to my snippets file!  I also learned a lot more about $regexp!!!

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