I am looking for a Perl module that would let me to compare two texts and tell me how similar they are. I have searched on CPAN, but I couldn't find anything. I need to come up with some arbitrary value that would tell how similar two texts are. I was thinking of implementing it myself (splitting two versions into fixed length substrings and then comparing how many of those substrings are the same in both texts), but I am sure there should be a better algorithm and possibly a module for this. The whole purpose of this is to allow for a user to enter an answer on a web form that would allow for a certain level of difference from the answer stored in the database.
Thank you in advance