I am using valid in my Sharepoint Server 2019 survey:
=LEN([Field1])>=6
It force a single line text field to have at least 6 digits But I need to add OR statement. I need to allow this field to have either 6 digits + or value "-" to pass. Logic behind this is that people can either write a text in this field or leave it blank. But I need them to write "-" by themselves cause otherwise they will make a lot mistakes by leaving blank fields. I need fail proof solution.
I tried multiple OR solutions but it all failed :(
Thank you!