Regular expression to blacklist a set of words

Question

I am trying to use an api provided by another website. There is a method searchReports to which I can pass a word or a regular expression(php). I want to pass a regular expression for matching anything other than these words. China,Russia,North Korea . I tried some but nothing worked

Answer 1

^(?!(country1|country2|country3)$).*$ finally worked. Thanks.

Answer 2

Maybe this one:

/^((?!(^china$)|(^russia$)|(^north korea$)).)*$/i

The "i" at the end stands for "ignore-case". Does php deal ok with it?

Answer 3

^(?!(country1|country2|country3)$).*$ finally worked. Thanks.