php email code regex

Question

Need some help with my email validation.. The "[email protected]@example.com" should be a valid email. But the php is showing that it is invalid. Any help would be awesome

You can execute the code here: http://sandbox.onlinephpfunctions.com/

    $unusual = "[email protected]@example.com";
$regex = "^[a-z0-9,!#\$%&'\*\+/=\?\^_`\{\|}~-]+(\.[a-z0-9,!#\$%&'\*\+/=\?\^_`\{\|}~-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*\.([a-z]{2,})$"; 
$normal = "^[a-z0-9_\+-]+(\.[a-z0-9_\+-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*\.([a-z]{2,4})$";
$domain = "[a-z0-9-]+(\.[a-z0-9-]+)*\.([a-z]{2,})$"; 

$dom = strrchr($unusual,"@");

//find length of the needle
$len = strlen($dom);

//find postion
$position = strpos($unusual,$dom);

//cut the string
$begin = substr("$unusual",0,$position);


$end = substr("$unusual",$position+1);

//display it
echo"$begin\n"; 
echo "$end";

if ( eregi( $normal, $begin ) ) {
     echo $begin . " is a valid local. We can accept it.";
} else { 
     echo $begin . " is an invalid local. Please try again.";
} 
if ( eregi( $domain, $end ) ) {
     echo $end . " is a valid domain. We can accept it.";
} else { 
     echo $end . " is an invalid domain. Please try again.";
}

This might be good reading - honestly, at some point, just make sure it looks something like an email address, and if it really matters, probably just send a validation email: stackoverflow.com/questions/201323/… — Mike
– Mike, Commented May 27, 2015 at 17:53
...This is a horrible idea. Generally, if it has an @ and a valid-looking domain after that, it's valid. Constructing a real regex to find valid emails just means that you'll have slightly fewer times that your "make sure this valid email is a real email" script runs. — anon
– anon, Commented May 27, 2015 at 18:38

diggersworld · Accepted Answer · 2015-05-27 18:15:46Z

3

I'm not a big fan of using regex when there are other functions PHP offers that are easier to read and understand. Try this:

$email = "[email protected]@example.com";

if ( ! filter_var($email, FILTER_VALIDATE_EMAIL) === false) 
{
    echo "$email is a valid email address";
} 
else 
{
    echo "$email is not a valid email address";
}

answered May 27, 2015 at 18:15

diggersworld

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