CWiki::RenameCategoryOnPage

function RenameCategoryOnPage($pageText, $oldCategoryName, $newCategoryName)
{
	$newCategoryName = preg_replace("/category:/isU", "", $newCategoryName);
	return preg_replace("/[[".GetMessage('CATEGORY_NAME').":".$oldCategoryName."]]/isU", "[[".GetMessage('CATEGORY_NAME').":".$newCategoryName."]]", $pageText);
}