how to ignore case in javascript code example

Example 1: how to compare strings in javascript ignoring case sensitive

const str1 = '[email protected]';
const str2 = '[email protected]';

str1 === str2; // false
str1.toLowerCase() === str2.toLowerCase(); // true

Example 2: js ignore case

var str = "Visit W3Schools!";
var patt1 = /W3S/i;
var res = patt1.ignoreCase