php - check if a string is a URL -

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• best way check if url valid 8 answers

i've seen many questions wasn't able understand how works want more simple case.

if have text, whatever is, i'd check if url or not.

$text = "something.com"; //this url  if (!isurl($text)){     echo "no not url";     exit; // die }else{     echo "yes url";     // else codes goes }  function isurl($url){     // ??? } 

is there other way rather checking javascript in case js blocked?

http://www.php.net/manual/en/function.preg-match.php#93824

<?php      $regex = "((https?|ftp)\:\/\/)?"; // scheme      $regex .= "([a-z0-9+!*(),;?&=\$_.-]+(\:[a-z0-9+!*(),;?&=\$_.-]+)?@)?"; // user , pass      $regex .= "([a-z0-9-.]*)\.([a-z]{2,3})"; // host or ip      $regex .= "(\:[0-9]{2,5})?"; // port      $regex .= "(\/([a-z0-9+\$_-]\.?)+)*\/?"; // path      $regex .= "(\?[a-z+&\$_.-][a-z0-9;:@&%=+\/\$_.-]*)?"; // query      $regex .= "(#[a-z_.-][a-z0-9+\$_.-]*)?"; // anchor          if(preg_match("/^$regex$/i", $url)) // `i` flag case-insensitive        {                 return true;         }  ?> 

but example url on simplified, (\w+)\.(\w+) match it. else mentioned filter_var filter_var($url, filter_validate_url) doesn't seem non-ascii characters so, beware...