about preg_replace

[Watson]

Hi,
I want to replace the keywords in a search result, I use the following code:

<?
$keyword = "key";
$result  = "key generation";
echo preg_replace ($keyword, "<font color = red>$keyword</font>", $result);
?>

It doesn't work, display nothing on the screen.

Could anybody help me,plz?

[udendra]

try:

echo eregi_replace ($keyword, "<font color=red>". $keyword ."</font>", $result); 

[Weedpacket]

<?
$keyword = "key";
$result  = "key generation";
echo str_replace ($keyword, "<font color =\"red\">$keyword</font>", $result);
?>

Eewww ... font tags! That is, like, so 1990s!