Regular expression question

[jumpenjuhosaphat]

Okay, I am trying to figure out the regex's so I can form my own.  I am currently trying to build a regex that will validate a URL.  The url can be:

http://www.domain.com

http://domain.com

http://www.domain.com/

http://domain.com/

http://sub.domain.com

 

or without the http, or with https, and accepting any TLD.

 

I need to strip anything after the TLD, so if there are 3 "/"'s, then anything after the third "/" will need to be removed.  Also, if the http(s) part isn't included, I would like to add it in.

 

Here is what I've come up with so far:

 

((http | https):\/\/){1}([a-zA-Z0-9]\.)*([a-zA-Z]+\/?)$

 

Is that even close?  Any help is appreciated, please.

[jumpenjuhosaphat]

Here is my second go at it:

 

^((http|https|ftp):\/\/){1}

(

([a-zA-Z0-9]([a-zA-Z0-9_-]\.)*)

(([a-zA-Z0-9][a-zA-Z0-9_-]*)+ \/?)$

)

[effigy]

Some related topics:

 

http://www.phpfreaks.com/forums/index.php/topic,123121.0.html

http://www.phpfreaks.com/forums/index.php/topic,96937.0.html

 

<pre>
<?php
$tests = array(
	'http://www.domain.com',
	'http://domain.com',
	'http://www.domain.com/',
	'http://domain.com/',
	'http://sub.domain.com'
);
foreach ($tests as $test) {
	echo $test, ' => ';
	echo preg_match('%
		^(?:https?|ftp)://
		(?:[a-zA-Z0-9]+\.)+
		[a-zA-Z0-9]+/?
		\z
	%x', $test);
	echo '<br>';
}
?>
</pre>

[jumpenjuhosaphat]

Okay, so I found a function called parse_url, that someone pointed out should work for what I need.

 

Here is how I used it:

  elseif($type=="url")
    {
    if(!preg_match("/^http(s)?/si", $var))
     {
     $var = "http://" . trim($var);
     }
     $var = parse_url( $var );
     $var=$var['scheme'] . "://" . $var['host'];
    }

 

What you don't see in this code is that I trimmed the $var variable and stripped slashes, and added slashes and stripped tags.  SHould this work for what I need it for?

[effigy]

http(s)? does not need the parentheses; use https?

 

SHould this work for what I need it for?

 

The best way to tell is to try it out. Create some test cases like I did, and see if the results are what you want.