How to detect if a text is in a given language?

Question

I have a kind of Q&A site (very approximately) where users enter questions to be answered by our Staff. I am quite concerned about users posting non-questions, which are an annoyance. The best I thought to far is a system to detect whether the text is in Italian (our users' language), and if it is, to check if it's not a copypasta against a list of common copypastas.

So, long story short: users will input some text, I have to make sure it's a proper question in Italian and not random characters.

Answer 1

Not sure what language you'll make

http://www.easywayserver.com/blog/java-string-contains-example/

How do I check if a string contains a specific word in PHP?

Checking if the input String (Question) contains any forbidden word would be one way to go at it.

Pseudo code

ListOfForbiddenWords;
if Language = Italian
    if Input does not contain any of ListOfForbiddenwords
         //It's fine
    else
         //Don't spam
else
    //You're not Italian

Not quite sure on what's the best way to check if a string is written in a specific language