Thanks for your interest in Syncfusion products.
We have tried to achieve your requirement by specifying the value for “mask” property as shown below,
//'C' specifies Custom character.
mask: "((C OR C) AND (C))",
Now in the maskedit textbox, numbers (based on particular criteria) will only be allowed in the place of ‘C’ (custom character). But unfortunately we are unable to achieve this requirement successfully.
On specifying the “mask” value as shown above, the characters ‘A’ and ‘N’ are ignored by the maskedit textbox. It considers as “alphabetic” and “numeric” values will fill these places.
We have confirmed this (unable to specify characters ‘A’ and ‘N’ in the mask value) as bug and we have logged a defect report on this. Fix for this issue will be available in any of our upcoming service pack releases. Usually our service pack release will be rolled out at the end of every month. We will update this thread once this issue is fixed.
Please let us know if you have further queries