N
var str = "This is a test sentence";
var hasTest = str.includes("test");
if(hasTest == true){
//do a thing
}
N
var string = "Hello world!";
var n = string.search("w"); //now n equals 6
N
var str = "foobar"
var regex = /foo/g;
if (str.search(regex) !== -1) {
alert("string conains foo!")
}