1. ES6 .includes()
:
var S = "fullweb";
S.includes("web");
2. RegExp .search()
:
var S = "fullweb";
S.search(/web/);
3. RegExp .match()
:
var S = "fullweb";
S.match(/web/);
4. RegExp .test()
:
var S = "fullweb";
/web/.test(S)
5. Good old .indexOf()
:
var S = "fullweb";
S.indexOf("web");