JavaScript Includes Case Insensitive

One of the most common operations that programmers use on strings is to check whether a string contains some other string.

In this post you will see how to check string contains whether other string with insensitive.

Way 1: Check string with match() method


            var str="WELCOME to CODE 4 Example";
            var regex = /welcome/i;
            var found = str.match(regex);

            console.log(found[0]);
            // WELCOME

var str="WELCOME to CODE 4 Example";

var regex = /welcome/i;

var found = str.match(regex);

console.log(found[0]);

// WELCOME

Way 2: Check string by converting to uppercase or lowercase


var str="WELCOME to CODE 4 Example";
var search="welcome";
var search2="Coding";

var state= str.toLowerCase().includes(search.toLowerCase());
var state2= str.toLowerCase().includes(search.toLowerCase());

console.log(state);//true
console.log(state2);//false

var str="WELCOME to CODE 4 Example";

var search="welcome";

var search2="Coding";

var state= str.toLowerCase().includes(search.toLowerCase());

var state2= str.toLowerCase().includes(search.toLowerCase());

console.log(state);//true

console.log(state2);//false

JavaScript Includes Case Insensitive1 min read

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