Forum Moderators: phranque
I should note that the quality of the code these things generate varies from bad to awful, simply because the tools and the regex patterns they generate are "too general" and therefore inefficient. I recommend that you take the code they output, and optimize the regex patterns for your URLs. For example, get rid of all patterns like (.*)/(.*)/ and replace them with ([^/]+)/([^/]+)/ wherever applicable.
For more information, see the "Regular-expressions patterns" section here [webmasterworld.com].
Jim