Hello Henk,
The MaskedTextBox is designed to use a regular expression for each character, but widget's mask, however, cannot be a single regular expression. What I can suggest you is to update the mask on runtime using setOptions based on the culture setting that user has chosen:
If single expression is the only way you can go, then I suppose that you can use the input
pattern attribute.
Regards,
Georgi Krustev
Telerik
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