Dear specialists,
I've learned a lot, but I can't handle with one problem described below:

I have a lot of 404's made of Google that indexed pages that was referals from other pages. So I found out, that each of them have a lot of words, mostly more than my real categories have. So, I need a rule that removes a /string/ which has over 25 letters (signs) it should be cutted.

Example pages ares:
FROM: /agito-kupony-rabatowe-wyprzedaze-promocje-i-znizki/promocje-saturn-i-karty-podarunkowe-w-konkursie-2013
TO: /promocje-saturn-i-karty-podarunkowe-w-konkursie-2013
or
FROM: /avans-kupony-rabatowe-promocja-wyprzedaz/sprzet-agd-electrolux-za-darmo-saturn
TO: /sprzet-agd-electrolux-za-darmo-saturn
so,
FROM /if_this_string_has_more_than_25_letters(signs)_cut_it_off/proper-string
TO: /proper-string

Is it possible?
Thanks again for you time,
Kalixo

Dear Luigi, thank you for help! I'll fix that manually.
Best regards,
Kalixo