How to restrict special design texts?

How to restrict or remove special design characters from TextBox?

Example - ꧁ŠԩąƉŏώ❥•҉ǤaϻeⱤ꧂ , ™Ꭰᥲʀκ͢❥Ӄᴎ͟͞ɪ͟͞ԍ͟͞ʜ͟͞ᴛ™Gamer] etc.

This is so disturbing and I don’t want to allow my users to use this type of texts. So how can I do this?

Either use this extension All Rescued Extensions From Inactive Communities - #4 by dora_paz - Extensions - MIT App Inventor Community or Refer this thread Text box that accept only letters

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