js if string in variable code example

Example 1: check for substring javascript

const string = "javascript";
const substring = "script";

console.log(string.includes(substring));  //true

Example 2: javascript check if string contains a text substring

stringVariable.includes("Your Text");

Example 3: string contains js

var str = "foobar"
var regex = /foo/g;
if (str.search(regex) !== -1) {
  alert("string conains foo!")
}