ereg_replace all items in a array

G'day PHP'ers I am trying highlight the results from a search, so far I have this working but only if the string is an exact match ie: case sensitive, for example: <?php $keywords = "foo"; $data = "This is a lower foo. This is an upper FOO. This is a ucase Foo"; $lower = strtolower($keywords); $upper = strtoupper($keywords); $ucase = ucwords($keywords); $words = array($lower, $upper, $ucase); while ( list($key, $val) = each($words) ) { $hilite = "<font color=\"#ff0000\">" . $val . "</font>"; $replaced = ereg_replace($val, $hilite, $data); } echo $replaced; ?> Now as metioned this seems to work only for "foo" does anyone have any idea why? Also I need to be able to support mutiple keywords ie: foo Foo FOO, so basically I know I could split(" ", $keywords) then some how traverse the array making a new array of all possible case combinations then in my while loop replace each occurance found in $data with the highlighted replacment, sounds easy hmm.... If anyone has any ideas or can see what I am doing wrong so far, it would be mutch appreciated. Regards, Joseph