Examples

Some example of validation expressions are as under

Example	Field in Form	Validation Expresssion
Validate that a phone number is 10 digits	phone_no	regex(., '^\d{10}$')
End date is after the start date	start_date, end_date	. > {start_date}
Input number is between 10 and 100	input_number	. >= 10 and .<= 100
Check that the input number is even	input_number	. mod 2 = 0
Email address is valid	email_address	regex(., '^[\w.%+-]+@[A-Za-z0-9.-]+.[A-Za-z]{2,}$')
Input Date is within the last 15 days	input_date	. >= today() - 15 and . <= today()
Ensure that at least one of the fields is filled	phone_no, email_address	(${phone_no} != '' or ${email_address} != '') [This condition should be put in the note field and the note field should be made mandatory]
Time is within 10 AM to 6 PM	input_time	. >= '10:00' and . <= '18:00'
Validate GPS coordinates within a specific area	location	.[0] > -2 and .[0] < 2 and .[1] > 34 and .[1] < 38 [checks that latitude is between -2 and 2, and longitude is between 34 and 38]
Check if name contains only alphabets	name	regex(., '^[A-Za-z ]+$')

Note - . (dot) refers to the current field that needs to be validated