Gibberish Detection for Feedback System

I have a feedback system for my game, that sends messages to a discord server. A common problem is that people occasionally spam gibberish.
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I was wondering if there was any way to filter out these gibberish strings, so they don’t show up anymore?

You could do word length, count, and letter frequency statistics. Real english text doesnt have one 14 letter word with 3 d’s in it.