Restrict the user to enter number of digits in inputbox

[#1]

Dear Community.

How can we restrict User to enter only equal to 4 digits value in input box.

suppose:

Year is in inputbox user need to enter the Year value like 2013.

if he enter less than 4 digits or more than 4 digits the input box need to prompt a message like Please enter only 4 digits.

and same for Month=2 digits

and same for Date =2.digits

Thanks,

Mukram.

[Gysbert_Wassenaar · Accepted solution]

On the Constraint tab select Custom and use this expression: isnum($) and len($)=4

Check Error Message and enter your prompt message.

[#3]

Dear Gysbert Wassenaar,

Thanks for your help.

it's working perfectly.

Thanks,

Mukram.