Hi,

1. how can i create custom Data Valitadation in cell to have only 3 signs, first as alphabetic and second and third as numbers from 0 to 99

Can you help please?

for example N06

2. Second issue is more difficult. I need DV list to have only 7 characters in cell, first has to be alphabetic letter, rest only digits, letters and underscore are allowed.
And i have to avoid empty spaces.

for example B33dv_1

Please help,
Best,
Jacek