Tiny minified JavaScript function to find out if a string contains a search word/tern using regex. Live demo on http://jsfiddle.net/apmepe5j/

does-string-contain.js

function is_in(a,b,c,d){return c=RegExp(b),d=c.test(a)}

alert(is_in("WHAK.com's awesome haystack!","needle"));

//returns false

alert(is_in("WHAK.com's awesome haystack!","some"));

//returns true