jquery string contains substring code example

Example 1: if str contains jquery

if (str.indexOf("Yes") >= 0)
  
  //case insensitive version
  if (str.toLowerCase().indexOf("yes") >= 0)

Example 2: check if word is in string javascript

var str = "Hello world, welcome to the universe.";
var n = str.includes("world");

Example 3: jquery check if string contains specific word

var a = 'how are you';
a.includes('are'); // will return true if string contains search term