Allow for padding on mask

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Currently, the pattern and mask seem to be very rigid...

It would be nice to define something like this:

What this should do (assuming my regex is correct) is allow for inputs of the following:
3/25
1/15
02/01
03/23

For some reason, most of these do NOT work.

02/01 - works
03/23 - works

Trying to type 3/25 yields -> 32/5
Trying to type 1/15 yields -> 11/5

Is there a way when the user types 3/ to force it to recognize that the user really means 03/?