[PHP]<style>
.green {color:#009900;}
.n {color:#336699;}
</style>
<?php
$str = 'function() { var a= 1; }';
$pattern = '/(var|typeof|new|return|if|for|in|while|break|do|continue|switch|case)([^a-z0-9\$_])/i';
$replacement = '<span class="green">$1</span>$2';
$str_n = preg_replace($pattern, $replacement, $str);
$pattern = '/(function)([^a-z0-9\$_])/i';
$replacement = '<span class="n">$1</span>$2';
echo preg_replace($pattern, $replacement, $str_n);

?>
[/PHP]
так все работает.
как объеденить?