I put in a string with 3 different kinds of links to test it.
PHP Code:
<?php
// Here is the test string with three types of links ...
$string = " Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat. Ut wisi enim ad minim veniam, quis nostrud exerci tation ullamcorper suscipit www.google.com ut aliquip ex ea commodo Duis autem vel eum iriure dolor in hendrerit in vulputate velit esse molestie consequat, vel illum dolore eu feugiat nulla facilisis at vero eros et accumsan et iusto odio dignissim qui blandit praesent luptatum zzril delenit augue duis dolore te feugait nulla facilisi. <br /><br /> Nam liber tempor cum soluta nobis eleifend option congue nihil imperdiet doming id quod mazim placerat facer possim assum. Email me: john@aol.com <br /><br /> Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod http://www.yahoo.com ut laoreet dolore magna aliquam erat volutpat. Ut wisi enim ad minim veniam, quis nostrud exerci tation ullam corper suscipit lobortis nisl ut aliquip ex ea commodo consequat. <br /><br /> ";
echo clickable_link($string);
function clickable_link($text) { # this functions deserves credit to the fine folks at phpbb.com
// pad it with a space so we can match things at the start of the 1st line. $ret = ' ' . $text;
// matches an "xxxx://yyyy" URL at the start of a line, or after a space. // xxxx can only be alpha characters. // yyyy is anything up to the first space, newline, comma, double quote or < $ret = preg_replace("#(^|[\n ])([\w]+?://[\w\#$%&~/.\-;:=,?@\[\]+]*)#is", "\\1<a href=\"\\2\" target=\"_blank\">\\2</a>", $ret);
// matches a "www|ftp.xxxx.yyyy[/zzzz]" kinda lazy URL thing // Must contain at least 2 dots. xxxx contains either alphanum, or "-" // zzzz is optional.. will contain everything up to the first space, newline, // comma, double quote or <. $ret = preg_replace("#(^|[\n ])((www|ftp)\.[\w\#$%&~/.\-;:=,?@\[\]+]*)#is", "\\1<a href=\"http://\\2\" target=\"_blank\">\\2</a>", $ret);
// matches an email@domain type address at the start of a line, or after a space. // Note: Only the followed chars are valid; alphanums, "-", "_" and or ".". $ret = preg_replace("#(^|[\n ])([a-z0-9&\-_.]+?)@([\w\-]+\.([\w\-\.]+\.)*[\w]+)#i", "\\1<a href=\"mailto:\\2@\\3\">\\2@\\3</a>", $ret);