Regex to match everything except a list of characters

Question

I want to match a line containing everything except the specified characters [I|V|X|M|C|D|L].

new Regex(@"^(.*) is (?![I|V|X|M|C|D|L].*)$")

should match everything except the characters mentioned in the OR list.

Should match -

name is a

Should not match -

edition is I

Answer 1

Try this pattern:

^[^IVXMCDL]*$

This will match the start of the string, followed by zero or more characters other than those specified in the character class, followed by the end of the string. In other words, it will not match any a string which contains those characters.

Also note that depending on how you're using it, you could probably use a simpler pattern like this:

[IVXMCDL]

And reject any string which matches the pattern.

Answer 2

You don't need | in this case, just use ^[^IVXMCDL]*$

^[^IVXMCDL]*$

Debuggex Demo