need help to create regular expression

Answer 1

This will match only strings that do not contain a single quotation mark (your question is very unspecific so I have no idea if that's what you want, please be as specific as possible and describe what you really want to do):

/^[^']*$/

Answer 2

If you want to say "match any character but zzz," use [^].

[^']+ will match one or more characters, up until it hits a '.

If you want to make sure the entire string does not contain the specified character:

^[^']*$