Data validation rules are triggered when a user adds or changes a cell value. This tutorial will demonstrate you how to create custom formulas in Data Validation in Excel and Google Sheets. Im not aware of a keyboard shortcut to find the INDIRECT function within a Data Validation drop down but to find any data validation on your worksheet hit F5 then click on Special and select data validation and click on OK.
In that case the counts dont match and data validation fails.
We can write a custom formula to ensure that the data in a cell begins with certain text. On the Ribbons Data tab click Data Validation. Select the cell s you want to create a rule for. If MATCH doesnt find a match any character it returns NA instead of a number.