hello world // $ret = preg_replace("#(.*?)(http://)?(www\.[^ \"\t\n\r<]+)#", "\\1", $ret); // if anchor text is empty, insert anchor's href $ret = preg_replace("#(]+>)()#", "\\1\\3\\4", $ret); $ret = preg_replace("/@(\w+)/", "@\\1", $ret); $ret = preg_replace("/#(\w+)/", "#\\1", $ret); return $ret; } function test($str) { print "INPUT: \"" . $str . "\"\nOUTPUT: " . twitterify($str) . "\n\n"; } // tests test("www.foo.com"); test("www.foo.com fox"); test("www.test.com fox jumped over www.foo.com"); test("fox jumped over www.test.com the fence www.foo.com"); ?>