Hello,
I have given constraints for accont no,mobile no,bban no in xlsx using regex.
It is working well in ODK central but it is not working correctly in ODK collect app.
One example of it is,regex for EMIS no is regex(.,'^[0-9]{9,12}$'),in odk collect it is taking maximum of 9 digits I cannot type beyond 9 digits in text field.
Any help would be appreciated 
Integer widgets will not accept decimal points, and the entry field has a limit of nine digits. If you need numbers larger than nine digits, see the Number text widget.
Source: https://docs.getodk.org/form-question-types/#integer-widget
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