i'm using
$Input = preg_replace("/[lnk](http:[[]*)[\/lnk]/", "<a href=\"\1\" target=_blank>\1</a>", $Input);
to replace [lnk] URL [/lnk] by an <A href>
this works perfect the only problem is the case sencitivity of [lnk] and [/lnk] is there a way to make the replace not case sencitive ???
thanks