script to check if input is valid url

[johnsmith153]

I need a script that checks if a string is in fact a valid url

 

I suppose anything starting http:// or www. should be o.k,

 

also, there are some addresses like: subdomain.site.com etc

 

and if doing for whole domain, please remember .co.uk urls (a lot of time I see script that works on .com but not .co.uk)

[Caesar]

Meh...different ways of doing it. In my half asleep state I will offer the following as a possibility...

 

<?php

function CheckURL($url) {
  if(preg_match('#http\:\/\/[aA-zZ0-9\.]+\.[aA-zZ\.]+#',$url)) return true;
    else return false;
}

?>

[johnsmith153]

You obviously did not read my post fully, this is not a solution.

 

www.anything.com would return false.

 

However, anyone who posts on here does so for free, so I can hardly complain. Thanks for taking the time to respond.

[redarrow]

Try this then please..

 

<?php

function CheckURL($url) {
  if(preg_match('(#http\:\/\/ || #http\:\/\/[aA-zZ0-9\.])[aA-zZ0-9\.]+\.[aA-zZ\.]+#',$url)) return true;
    else return false;
}

?>

[nrg_alpha]

I see this link being referred to in other forums. It explains things thoroughly. I haven't actually tested this, as I don't even use regex for this sort of thing (I'll link to what I use in a second). But the link includes a table of the lexical tokens section of RFC822 and more. It's thorough yet complex 

 

The method I use involves the filter_var() function. In either case, have a look here to see it's simplicity. It is the last code snippet prior to the comment page that I am pointing attention to.

 

Hope this helps..

 

Cheers,

 

NRG

[The Little Guy]

Try this:

function CheckURL($url) {
     if(preg_match('~((http|https|ftp|ftps)://|www.)(.+?)~',$url)) 
          return true;
     else 
          return false;
}