PHP - Function To Find Links In Text

[twofortwo]

I have got a function that converts strings like 'www.example.com' and 'http://example.com' in hyperlinks. It also deals with subdomains e.g. 'http://sub.example.com'.But it fails with this one - http://www.example.com' and outputs the following\[code\]<a href="http://<a href="http://www.chemica.ru">www.chemica.ru</a>">http://<a href="http://www.chemica.ru">www.chemica.ru</a></a>\[/code\]Please, can anyone help? The problem is that both 'http://' and 'www.' are together and both have different ways of converting.\[code\]function makeLinks($text){ $text = eregi_replace('(((f|ht){1}tp://)[-a-zA-Z0-9@:%_\+.~#?&//=]+)', '<a href="http://stackoverflow.com//1">\\1</a>', $text); $text = eregi_replace('(www.[-a-zA-Z0-9@:%_\+.~#?&//=]+)', '<a href="http://\\1">\\1</a>', $text); $text = eregi_replace('([_\.0-9a-z-]+@([0-9a-z][0-9a-z-]+\.)+[a-z]{2,3})', '<a href="mailto:\\1">\\1</a>', $text); return $text; }\[/code\]