"[^0-9a-zA-Z\s]" add roman nos. I to V and ' in it

"[^0-9a-zA-Z\s]" . this is my regular expression pattern to clean user input
i want to add roman nos. I to V and ' in it kindly help me where to put these

re: "[^0-9a-zA-Z\s]" add roman nos. I to V and ' in it

Your current regular expression matches anything that is not a number, not a character, and not whitespace.

Consider changing it so that it matches anything that is not a number, not a character unless it's one between I and V, and not whitespace.

Something like:
[^0-9a-hw-z\s]

Regular expressions are as easy as breaking it down into what you want.
You can test your logic on sites like this one.

-Frinny