I go cross-eyed when it comes to reading this stuff.  I hacked some
code I found, catches "bit.ly" but not (for example) "ff.im"

(Can I post code here?)

function urls2link($text){
        if (strpos($text, '...')==0) { // don't ask!
        $pattern = '\b((((H|h)(T|t)(T|t)(P|p))\://)?(www.|[a-zA-Z0-9]{1,99}.)
        $pattern .= '(\:[0-9]{1,5})*(/(|[a-zA-Z0-9\.\,\;\?\'\\\+&%\$#\=~_\-]
        $replacement = '\'<a target="_new" href="\'.((\'$4\' == \'\')?
                >$1</a> $16\'';
        return preg_replace('¦'.$pattern.'¦e', $replacement, $text); }
        else return $text;

Works most of the time, but clearly has issues.  I figure somebody has
already solved this and wants to share ;-)

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