Replacing AND Reusing Text

rpanning

I'm making a function that will replace email addresses with some JavaScript, for bot protection. What it needs to do is replace the email with JavaScript depending on it's location. If it's a mailto anchor tag it will replace it with something, if it's between tags (so it's displayed text) it will replace it with something else, BUT if it's IN a tag it won't replace anything (like a meta tag). Now that isn't to hard but I'll need help with the regex stuff.

The other part is that it needs to use the email address found. Like it needs to find the user and domain to use in the replaced text. I don't know how to do this and/or both of these things at the same time. Any help or ideas would be great.

pyro

Not sure exactly what you need, but see if this helps:

<?PHP
$text = "<p>Lorem ipsum dolor sit amet <a href=\"mailto:you@your.com\">your email</a> Lorem ipsum dolor sit amet <a href=\"mailto:me@my.com\">my email</a></p>";
preg_match_all("/<a href=[\"|']mailto:(.*?)[\"|']>(.*?)<\\/a>/", $text, $email);
echo $email[1][0]; #contains the email address in the href for the first link
echo $email[2][0]; #contains the text in the link for the first link
?>

rpanning

Your close. Let me give you a detailed example:

<?php 
function callback($buffer)
{
    // Here's where the email's will be replaced
}

ob_start('callback');
?>
<html>
<title>Test</title>
<meta name="reply-to" content="webmaster@domain.com">
<body>
.... Text Text
<a href="mailto:me@domain.com">me@domain.com</a>
.... More Text me@domain.com Text Text...
</body>
</html>
<?php ob_end_flush(); ?>

I'll be buffering the output then when I flush it the callback function goes through the buffer and replaces certain emails. If it's in the anchor tag it'll be replaced with "javascript:getEmail(user,domain);". With the above example, <a href="mailto:me@domain.com">, mailto:me@domain.com will be replaced with javascript:getEmail('me','domain.com'). If the email is between tags, like between > and <, then it will be replaced with <script>showEmail(user,domain);</script> Using the above example, me@domain.com (between the anchor tags and below that) will be replaced with <script>showEmail('me','domain.com');</script>. Note that the the email between tags might not be DIRECTLY between tags (and not anchor tags specificly), there could be other text in their. Now, the email in the meta tag will not be touched. Thanks for your help!

pyro

Ok, then... Try something like this:

<?php 
function callback($buffer) {
	$buffer = preg_replace("/(<a href=[\"|'])mailto:([\w\.]+)(@){1}([\w\.]+)([\"|']>)/", "$1javascript:getEmail('$2','$4');$5", $buffer);
	$buffer = preg_replace("/(([\w\.]+)(@){1}([\w\.]+))([^>]*<)/", "<script type=\"text/javascript\">showEmail('$2','$4');</script>$5",$buffer);
	return $buffer;// Here's where the email's will be replaced
}

ob_start('callback');
?>
<html>
<title>Test</title>
<meta name="reply-to" content="webmaster@domain.com">
<head>
<script type="text/javascript">
function showEmail(user, domain) {
	document.write(user+"@"+domain);
}
function getEmail(user, domain) {
	location = "mailto:"+user+"@"+domain;
}
</script>
</head>
<body>
.... Text Text
<a href="mailto:me@domain.com">me@domain.com</a>
....More Text....
me@domain.com 
....Text Text....</body>
</html>
<?php ob_end_flush(); ?>

Though keep in mind that 13% of user do not use JavaScript, so you might be better of with something that just changes the @ to &#64; and the . to &#46;

rpanning

Thanks, just what I was looking for. After your first post I knew to use preg_replace but I couldn't get the regex right.

Originally posted by pyro
Though keep in mind that 13% of user do not use JavaScript, so you might be better of with something that just changes the @ to &#64; and the . to &#46;

I thought about this but how well does it work against bots? Wouldn't JavaScript be a little better or does that work just as well?

pyro

To be honest, I'm not sure. I've heard that using the character entities works to prevent spamming, but can't verify it myeslf. As far as using JavaScript, it's really a bad idea, as you are left with unaccessible pages...

rpanning

Ok, after a LONG time I finaly got back to this regex thing. I've created my own regular expresion but I want someone to double check and see if it's doing what I want it to (from the posts above).

Email Inside Anchor: /(<a.+href\=[\"'])mailto:([-.\w]+)@([-.\w]+.\w+)([\"'].+>)/i
Between Tags: /(>[^{<])(\b[-.\w]+)@([-.\w]+.\w+\b)([^>]<)/is}

That is what I have come up with. Finaly learned regex. 🙂 If something looks wrong here please let me know. Thanks!