JavaScript or jQuery equivalent of PHP's strstr() function

Question

Is there a function in jQuery or JavaScript that does the same as strstr() in PHP?

I have an AJAX response that should be 1,2,3,12,13,23 or 123. I want

Answer 1

Ok I just found something that works!

http://my-sliit.blogspot.com/2008/06/search-string-javascript-like-strstr-in.html

Thanks for your contributions :)