How can I invert a regular expression in JavaScript?

Question

I have a string A and want to test if another string B is not part of it. This is a very simple regex whose result can be inverted afterwards.

I could do:

Answer 1

If what you're searching for really isn't more complicated than a simple string like "foobar":

if (yourString.indexOf("foobar") === -1) {
  // ...
}

http://www.w3schools.com/jsref/jsref_indexOf.asp