I have a text field inside my screen and i want to prevent users from entering characters or special characters except the comma ",". so the field should only allow numbers separated by ","... i can prevent the special chars as per this thread https://powerusers.microsoft.com/t5/Building-Power-Apps/How-i-can-make-sure-that-the-user-did-not-enter-any-special/td-p/2460592 .. but not sure about the char part?

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