You are right that you can force the cursor to skip placeholders with the mouse, but please note that you are not allowed to enter any numbers on that place. Also, please note that the AllowSkipPlaceholders property is designed to restrict the input of the control, not the navigation. Hence, the reported behavior is expected.
Regarding the RegEx questions, internally for the Mask property we are not using RegEx. We use the TryParce() method of the native types. Basically, if that native method successfully parses the given string, we assign it as Value of the control. Hence, I am afraid I cannot provide you with such RegEx.
Pavel R. Pavlov
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