I would like to have validation on a column that IF you type in the field you have to use 19 letters. But if you leave the field blank you can still save.

Right now I use this:

=IF(LEN([column 1])=19
  • Do you want the letters to be exact 19? – Ganesh Sanap Jan 24 at 7:11

Try using below formula:

=IF(ISBLANK([column 1]), true, IF(LEN([column 1])=19, true, false)

This will allow users to add either blank values or the text with length of exact 19 characters.

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