Contact number with exactly 11 digits?

Hi,
Could we limit the response of numerical numbers?
For example, Contact number? For this question, I only want exactly 11 digits?

Thank You

Hello,
Might be just a simple numeric constraint
. >= 10000000000 and . <= 99999999999
Or can you have leading zeros?
Could you provide more details for valid entries, please?

Did you already take a look at the support documentation and previous forum discussion?
https://support.kobotoolbox.org/restrict_responses.html?highlight=regex
https://community.kobotoolbox.org/search?q=%20restrict%20phone%20number

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