I need to data validate a column so that it only allow: A-Å, a-å, 0-9, Comma, dot, ?, !, -, +, (, ), :, <, >
I use this custom formula: =REGEXMATCH(A1:1,"[^a-zA-Z0-9\s]")
But I cannot get the dialog box to save the formula? and how do I get my regex to match my allowed characters?
Only if I exclude the = from the formula field but then the data validate does not work...
https://docs.google.com/spreadsheets/d/1_MeBbhL1nR1rF1JYGI2cpd88VAhqKJCgN25KS6STfWU/edit?usp=sharing