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I'm actually wanting to keep them, but continuing to play in designer I realised I made a silly mistake and it worked fine -.- Thats a really useful formula, is there a reverse for getting rid of all ascii characters?
[ -~] uses (space) followed by a dash followed by a tilde. This regex expression includes all the characters between space and tilde. If you see the below chart any character from 32 to 126 is replaced with '' as per the below regex formula and the rest of the characters will remain