Restrict length of batch number

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In the phone number constraint example with (regex(.,'[0-9]{11}')) the {11} is checking for a length of 11. The {} can take 2 arguments {min,max}. So for a batch number of 3-8 digits of all numbers you could do appearance = numbers and constraint = regex(.,'^[0-9]{3,8}$').

More details in the documentation on using regular expressions can be found in the docs.