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Unfortunately it is not possible to limit the input type Matrix table to only 5 digits. If you want to limit the input to only 5 digits, you will need to use a regular textbox field and set an input mask to that field.
You can check out this guide for more info: Getting Started with the basics of Input Masking
Alternatively, you can also use the Masked Input widget to limit the input to only 5 digits. http://widgets.jotform.com/widget/masked_input
If you need further assistance, please let us know.
Thanks but that doesn't help much.
Sorry but was not able to accomplish what you are looking for. I tried various methods but none worked. The only way at the moment would be to use the SOURCE CODE of the form. and add the attribute MAXLENGTH in the fields you would like to restrict.