Condition text field to be only number

[Kal_Lam]

@mosucaa, you should be able to do it as outlined in the post discussed previously:

I use regex code but i want not type more than 11 digits

Welcome to the community, @mdnurnabi! Try the following regex code: regex(., '^[0-9]{11}$') Note: You will have to make the question type as text and appearance as numbers. For more regex code, please visit our support article Restricting Text Responses With Regular Expressions.