Pretty cool, the preg_match() function is pretty wicked! Is there a way to make sure it has a .com/.co.uk/etc?

Something like this usually is what people do(if it doesn't work, keep in mind i just wrote this RIGHT now)

$preg = "/http:\/\/([a-z0-9]{2,}\-?\.[a-z]{2,3})(\.?[a-z]{2,3})?/i"

I haven't tested that... Maybe Matt knows a better one(considering I'm not too good at regex, it takes me a wile to get it right).

how about this i made yesterday;

THE CODE - one liner
[PHP]$urlregex = "^(https?|ftp)\:\/\/([a-z0-9+!*(),;?&=\$_.-]+(\:[a-z0-9+!*(),;?&=\$_.-]+)?@)?[a-z0-9+\$_-]+(\.[a-z0-9+\$_-]+)*(\:[0-9]{2,5})?(\/([a-z0-9+\$_-]\.?)+)*\/?(\?[a-z+&\$_.-][a-z0-9;:@/&%=+\$_.-]*)?(#[a-z_.-][a-z0-9+\$_.-]*)?\$";
if (eregi($urlregex, $url)) {echo "good";} else {echo "bad";}[/PHP]

(OPTIONAL: READ BELOW FOR EXPLANATION)

it will validate all these types of urls
[PHP]
// valid urls
$url = "https://user:pass@www.somewhere.com:8080/login.php?do=login&style=%23#pagetop";
$url = "http://user@www.somewhere.com/#pagetop";
$url = "https://somewhere.com/index.html";
$url = "ftp://user:****@somewhere.com:21/";
$url = "http://somewhere.com/index.html/"; //this is valid!!
[/PHP]

THE CODE - broken into section for easy editing and understanding:
[PHP]
// SCHEME
$urlregex = "^(https?|ftp)\:\/\/";

// USER AND PASS (optional)
$urlregex .= "([a-z0-9+!*(),;?&=\$_.-]+(\:[a-z0-9+!*(),;?&=\$_.-]+)?@)?";

// HOSTNAME OR IP
$urlregex .= "[a-z0-9+\$_-]+(\.[a-z0-9+\$_-]+)*"; // http://x = allowed (ex. http://localhost, http://routerlogin)
//$urlregex .= "[a-z0-9+\$_-]+(\.[a-z0-9+\$_-]+)+"; // http://x.x = minimum
//$urlregex .= "([a-z0-9+\$_-]+\.)*[a-z0-9+\$_-]{2,3}"; // http://x.xx(x) = minimum
//use only one of the above

// PORT (optional)
$urlregex .= "(\:[0-9]{2,5})?";
// PATH (optional)
$urlregex .= "(\/([a-z0-9+\$_-]\.?)+)*\/?";
// GET Query (optional)
$urlregex .= "(\?[a-z+&\$_.-][a-z0-9;:@/&%=+\$_.-]*)?";
// ANCHOR (optional)
$urlregex .= "(#[a-z_.-][a-z0-9+\$_.-]*)?\$";

// check
if (eregi($urlregex, $url)) {echo "good";} else {echo "bad";}

[/PHP]

all the lines in the code above can be safely removed (except for hostname) if you don't want to allow some URL segment (if you don't want getqueries in your urls, just comment the respective $urlregex .= ....) - but do not reorder them.
the "(optional)" states that the part MAY exist, but url will be valid even if it doesn't contain the part (see the valid urls above).

syntax:
[code] :// [user[:pass]@] hostname [port] [/path] [?getquery] [anchor][/code]
-taking into account allowed safe characters
-assuming .. (dot dot) is never allowed in hostname or path

FEEDBACK IS APPRECIATED

Quite nice, i'd needed a good way to validate URL's! the last comment is very good! tnx!

Nice... does it handle non-tlds like .co.uk, .net.uk, .cn etc.?

===Toby===

Good job fqa at vardagsrummet.mine.nu !
tx for sharing

Thanks for that. I've been working on that very issue.

See it in action at http://www.MyWeddingHosting.com/blog.php

Josh

@fqa: what about an url like this:
http://www-google-com
http://www_google_com

I've been trying to get this to work with preg_match():

// SCHEME
$urlregex = "^(https?|ftp)://";

// USER AND PASS (optional)
$urlregex .= "([a-z0-9+!*(),;?&=$_.-]+(:[a-z0-9+!*(),;?&=$_.-]+)?@)?";

// HOSTNAME OR IP
$urlregex .= "[a-z0-9+$_-]+(.[a-z0-9+$_-]+)*"; // http://x = allowed (ex. http://localhost, http://routerlogin)
//$urlregex .= "[a-z0-9+$_-]+(.[a-z0-9+$_-]+)+"; // http://x.x = minimum
//$urlregex .= "([a-z0-9+$_-]+.)*[a-z0-9+$_-]{2,3}"; // http://x.xx(x) = minimum
//use only one of the above

// PORT (optional)
$urlregex .= "(:[0-9]{2,5})?";
// PATH (optional)
$urlregex .= "(/([a-z0-9+$_-].?)+)*/?";
// GET Query (optional)
$urlregex .= "(?[a-z+&$_.-][a-z0-9;:@/&%=+$_.-]*)?";
// ANCHOR (optional)
$urlregex .= "(#[a-z_.-][a-z0-9+$_.-]*)?$";

// check
if (eregi($urlregex, $url)) {echo "good";} else {echo "bad";}

The problem seems to be that this is POSIX and for preg it needs to be PCRE. I'm having quite a time with it. Anyone know how to fix it?