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Level 2

Is it possible to

force a numeric pattern to display a pattern like XXXXX-XXX no matter how many numbers are entered?  I want to lock the field to 8 numeric characters (without using a comb), and a hyphen between the 5th & the sixth.  Currently, my field forces the pattern, but if I put in more than 8 characters, the pattern goes away, and allows a new pattern like this: XXX,XXX,XXX

Is this possible?  If so, please walk me through the process.

Thank you!