For the unaware (including myself): https://en.wikipedia.org/wiki/Zalgo_text https://en.wikipedia.org/wiki/Zalgo_text If you really think you need to programma

For the unaware (including myself): https://en.wikipedia.org/wiki/Zalgo_text https://en.wikipedia.org/wiki/Zalgo_text If you really think you need to programmatically detect and reject these (I'm dubious), there is probably a reasonable limit on the number of diacritics per character. https://stackoverflow.com/a/11983435 https://stackoverflow.com/a/11983435