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[mathieubossaert]

Hi @Faisal_Amani ,

You will find a regexp contraint for that in the xlsform template

ODK XLSForm Template

[Preview of the XLSForm template] Many of you have asked for an XLSForm template that brings together the community's best form design techniques and is kept up-to-date by the core team. Here it is! ODK XLSForm Template (Google Sheet, use File > Make a copy) ODK XLSForm Template (Microsoft Excel) Whether you're a long time ODKer or new to form design, here are five reasons why you'll love this template: Helpful hints about each column

See screenshot

[Thoughtful hints abo…