Limit input to 3 digits before decimal and one digit after decimal

[Kal_Lam]

Welcome to the community, @an_ju! This post discussed previously should help you solve your issue:

Limit decimal digits in decimal question

Dear @Kal_Lam and @wroos I think I finally found something working as I want it , at least with the value I tried to enter on Enketo it works. So, with a Decimal question, as a Validation Criteria/Constraint, I used .<500 and regex(.,’^(\d{0,3})(\.[0-9]{0,1})?$') In that way, the maximum acceptable value is smaller than 500. It includes that there can be a maximum of 3 digits before the point, which is not really necessary as the maximum is 500, but it didn’t work if I took it away…