javascript string search

javascript string search.js

// 1. includes (introduced in ES6) 
var string = "string to search for substring",
    substring = "sea";
string.includes(substring);

// 2. RegExp: test
var string = "string to search for substring",
    expr = /sea/;  // no quotes here
expr.test(string);

//3. string.search
var string = "string to search for substring",
    expr = "/sea/";
string.search(expr);

//4. lodash: includes
var string = "string to search for substring",
    substring = "sea";
_.includes(string, substring);

// 5. string.match
var string = "string to search for substring",
    expr = "/sea/";
string.match(expr);

// 3. string.indexOf
var string = "string to search for substring",
    substring = "sea";
string.indexOf(substring) !== -1;