Change url to clickable link by javascript

Hi there,
I want to chage all url in my web to clickable automatically.


I found a php code to do it:

document.writeln("  $text = eregi_replace('([[:space:]()[{}])?(((f|ht){1}tp://)[-a-zA-Z0-9@:%_+.~#?&//=]+)([[:space:]()[{}])?', ' <a href=\"2\" target=\"_blank\">2</a> ', $text); "); 
document.writeln(" $text = eregi_replace('([[:space:]()[{}])?(www.[-a-zA-Z0-9@:%_+.~#?&//=]+)([[:space:]()[{}])?', '1 <a href=\"http://2\" target=\"_blank\">2</a> ', $text); "); 
document.writeln(" $text = eregi_replace('([[:space:]()[{}])?(file:(/)?[-a-zA-Z0-9@:%_+.~#?&//=]+)([[:space:]()[{}])?', '1 <a href=\"2\">2</a> ', $text); "); 
document.writeln(" $text = eregi_replace('([_.0-9a-z-]+@([0-9a-z][0-9a-z-]+.)+[a-z]{2,3})', '<a href=\"mailto:1\">2</a>', $text);   ");

PHP:

Can anyone convert it to javascript or give me a javascript to do it?

Ex:
URL:

http://forums.digitalpoint.com

Code (markup):

To clickable link: http://forums.digitalpoint.com
Please help me do this. Thanks very much!

 

use this regex in javascript

/(https?|ftp|file):\/\/[-A-Z0-9+&@#\/%?=~_|!:,.;]*[-A-Z0-9+&@#\/%=~_|]/ig

 

Can you explain how can I do it, please!
Thank you.

 

var str = 'http://forums.digitalpoint.com/';
var newstr = str.replace(/(https?|ftp|file):\/\/[-A-Z0-9+&@#\/%?=~_|!:,.;]*[-A-Z0-9+&@#\/%=~_|]/ig, 
 function(){
  var link = arguments[0];
  if(link) {
    return '<a href="'+link +'">' + link +'</a>';
  }
 }
);

Code (markup):

sorry, a bit late.