How to use a Datagroup of URI Strings to compare and select pool based on HTTP :: Path

Can you try this iRule?

when HTTP_REQUEST {
	if { [string tolower [HTTP::path]] starts_with "/a/b" } {
		set newPath [string map {"/a/b" ""} [HTTP::path]]
		# log local0. "Path without /a/b: $newPath"
		
		if { [class match [string tolower $newPath] equals x_uri_list] } {
			pool x_pool
		}
		elseif { [class match [string tolower $newPath] equals y_uri_list] } {
			pool y_pool
		}
		else {
			# reject
		}
	}
	else {
		# reject
	}
}