Click on the "+" icon
Click on the "Tooltip Guide"
Enter a name for the Tooltip
Add a Rule
Click on "Submit"
Click on "Add Step"
Select the element on which you want the tooltip to work
Select "Validation type" from here
Select "Regular expression"
Regular expressions (shortened as "regex") are special strings representing a pattern to be matched in a search operation
Enter the regex and a message for sake of displaying on tooltip and save it
Ensure that the parent folder is published where you have created the tooltip guide
When your entries do not match with the regex, the validation message will appear like this