javascript match case insensitive code example

Example 1: javascript string search case insensitive

function stringContainsCaseInsensitive(search, subject){
    return subject.toLowerCase().indexOf(search.toLowerCase()) !== -1;
}

stringContainsCaseInsensitive("red","We painted the room red.");//true

Example 2: js includes case insensitive

var passedinstring = localStorage.getItem("passedinstring").toLowerCase();

Example 3: javascript case insensitive regex

// It's the 'i' flag at the end of the expression.

/hello world/.test('Hello World'); // False
/hello world/i.test('Hello World'); // True

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