Very simple email validation (+ mysql_real_escape_string)

[tomhoad]

Hi there

 

I am using this function to do a very simple email validation:

 

function checkEmail($email) 
		{
		   if(eregi("^[a-zA-Z0-9_]+@[a-zA-Z0-9\-]+\.[a-zA-Z0-9\-\.]+$]", $email)) 
		   {
			  return FALSE;
		   }
		}

            $email   = mysql_real_escape_string($_POST['email']);

		if(checkEmail($email) == FALSE) 
		{
		   echo "<p class=\"thankyou\">E-mail entered is not valid</p>";
		} 
		else 
		{
		    $comp_name = "Great competition!";
			$query = " INSERT INTO comps (email, comp_name) ". 
			" VALUES ('$email','$comp_name')"; 
			mysql_query($query) or die('Error ,query failed');
			echo "<p class=\"thankyou\">Thanks for entering!</p>";
		}

 

However, it always returns FALSE, even if it's a valid email. I think it's the way I'm suign mysql real escape string with it. Can anyone point me in the right direction?

[joesaddigh]

Would it not be easier to use javascript. Im new to all of this but i have used some email validation in my script. The javascript code is as follows.

 

 

<script type="text/javascript">

var msg = '';

function validate_form()
{
	valid = true;

                if(checkEmail(document.enrolment.email.value) == false)

	{
		msg=msg+"Email address is not valid.\n";
		valid = false;
	}

if(msg=="" && valid ==true)
	{
		MM_popupMsg('Registration Complete!')
		register.submit();
	}

	else
	{
		msg = "You have the following errors which must be corrected to enrol: \n" + msg;
		alert (msg);
		//Initialise variable
		msg = '';
	}
	return valid;
}

//Display Message Registration complete
function MM_popupMsg(msg) 
{ 
  alert(msg);
}

//Check that email address is a valid format
function checkEmail(toCheck) 
{
	if (/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/.test(toCheck))
	{
		return (true)
	}
	return (false)
}

 

 

Hope this is of some help

 

 

[tomhoad]

Hi thanks for the reply. I have zero knowledge of javascript, would prefer to edit what I already have half-working.

 

Thanks anyway

[gffg4574fghsDSGDGKJYM]

This should work :

 

<?php

$email = "[email protected]";

if (!eregi("^[a-z0-9\-\_\.\%\+]+@[a-z0-9\-\_]+\.[a-z]+$", $email))
{
echo "Invalid Email! ".$email;
} else {
echo "Valid Email! ".$email;
}

?>

 

However it won't work for email address using IP address instead of a domain name. It may return some false positive and probably need to be better tested before use.

[tomhoad]

The $email variable is coming from a form, hence the $POST.

 

I need to use mysql_real_escape_string, as well as validating that variable.

[gffg4574fghsDSGDGKJYM]

Take the example i gave you and put it in your code.

And no regular expression aren't vulnerable to SQL injection so escape your string after you have tested it.