How post comments into my own blog network

Hi, i have a blog network made with wordpress (individually blogs), now i want automate the comment posting (i know how do with scrapebox), but i need change the content when detect a keyword in url or title, example:
url 1: mydomain.com/animals/horses/the-old-horse-will-dead.html
url 2: mydomain.com/motor/cars/the-car-is-clean.html

keyword: cars and horses
comment template:
text comment spinned, {phrase one|phrase two ##keyword##}(here replace by horse or birds if detect it in url) more text spinned

How can i do it?
i have more than 7000 urls classified
I know that with senuke can do the replacement of keyword in a text, but don't know how detect the url where select the keyword

Thanks

I'm not even sure you can program or configure SB in such a way to do that. I would be very interested in hear if this is possible..

btw, is this more suited to blackhat seo?