Hi, I am trying to restrict the phone number on a koboform to specific numbers (9 digits only) but when I put the restriction 9 or less it didn’t work and it is not good either as I don’t want it to go beyond 9 digits, could you help me

Hi You may want to try using a text field and set the constraint to regex(.,’^[0-9]{9}$’) and appearance = numbers. This should be able to sort out your issue.

hi, Thank you for your response, I did what you advised, but when I tried to deploy the form, it gives me the attached message. I appreciate your help [Capture]

Hi Please try using a text field and set the constraint to regex(.,’[0-9]{9}’) and appearance=numbers.

hi, you can use this regular expression regex(.,’^[0-9]{1,9}$’). It allows input from 1 to 9 digits.

[image] eben: regex(.,’[0-9]{9}’) Please note that this wont work; regex’s match substrings, so although your regex requires 9 characters (“[...]{9}”) it will also match a phone number with 10, 11, or 1000 numbers - because it will still successfully find a substring of exactly 9 digits. Typ…

Thanks for the education, I’m very grateful! I normally write my regex without the the ‘^’ and ‘$’ symbols and yet they work; Is there a possible explanation to this?

[image] eben: and yet they work Typically you only notice the difference if the user enters garbage before the target string, or extra characters after the string. Play around with this form and you’ll see the difference regex.xls (5.5 KB) Try entering “1234567890” (10 digits) and “a1234567…

Try this in constraints field: regex(.,’[0-9]{9}’)

Thank you very much to all. Your answers helped me solve a similar problem related to the age field, as I was able to prevent the wrong entry of the birth year instead of age

Hi @ammarbader Welcome to the community forum. I am glad to know that you were able to utilize this in your work. We look forward to your experience and support on the community forum. Stephane

Number constraints

User Support Form Building

wroos September 3, 2020, 9:14pm 13

Hello @eben, @moteb_marei,
To add to @Xiphware. The essentail differnce between Collect and Enketo was discussed here