The writing of the regular expression of kneeling

Online Help PHP regular expression notation.
All URLs that appear in the following text want to be in the form of hyperlinks.

"Text www.baidu.com text
Www.html.com
Text http://www.baidu.com
Https://www.google.com "

The code is as follows:
Public Function make_clickable ($STR) {
$str = Preg_replace ("([^" =\;]) ((http://|https://|ftp://|ftps://|www.) [^\s<]+[^\s<\.)]) ' I ', ' $1$2 ', $str);
return $str;
}

Problem:
When the text is www.baidu.com, the hyperlink becomes http://localhost/www.baidu.com

www before the case of HTTP or HTTPS, want to replace http://www.baidu.com format, and then replaced by hyperlinks,
Kneel to the regular expression style.

Reply to discussion (solution)

On this basis changed the next

$s = ' "text www.baidu.com text www.html.com text http://www.baidu.comhttps://www.google.com" '; Echo make_clickable ($s); function Make_clickable ($str) {   $str = Preg_replace ("" ([^] =\;]) ((http://|https://|ftp://|ftps://|www.) [^\s<]+[^\s<\.)]) ' IE ', "_link (' \\1 ', ' \\2 ')", $str);   return $STR;} function _link ($text, $link) {if (Explode ('. ', $link) [0]== ' www ') {$link = ' http://'. $link;} Return $text. $link. ';}

Very useful. Thank

Class Convert
{
/*
* Urlを from でリンク form occupies
*/
Public Function make_clickable ($STR)
{

$str = Preg_replace ("([^" =\ ']) (http://|https://|ftp://|ftps://|www.) [^\s<]+[^\s<\.)]) ' IE ', "self::_link (' \\1 ', ' \\2 ')", $str);
return $str;

}

private static function _link ($text, $link)
{
if (Explode ('. ', $link) [0] = = ' www ') {

$link = ' http://'. $link;

}
Return $text. '' . $link. '';
}
}

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