I have a a validation that only accepts a specific format of 6numbers followed by a dash and further 6 numbers as below:
=IF(ISBLANK(FAQ),TRUE,AND(LEN(FAQ)=13,MID(FAQ,7,1)="-",ISNUMBER(MID(FAQ,1,6)+0),LEN(TRIM(MID(FAQ,1,6)))=6,ISNUMBER(MID(FAQ,8,6)+0),LEN(TRIM(MID(FAQ,8,6)))=6))
This works perfectly, however I have to add a further condition that can be entered and this is the phrase 'Not Required'.
Basically the validation will still accept a blank field, a Not required or numbers is the specific format as current formula.
How to I go to add this condition?