Case Insensitive String Search

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Preparation HTML

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RegExp
function escapeRegExp(string) {
	return string.replace(/[.*+?^${}()|[\]\\]/g, "\\$&"); // $& means the whole matched string
}


function getElement() {
	return document.querySelector("label")
}

function compute(element) {
	let text = element.textContent;
	let title = element.getAttribute("title");
	return (new RegExp(escapeRegExp(text), "gi").test(title) ||
			new RegExp(escapeRegExp(title), "gi").test(text))
}

compute(getElement())
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Includes LowerCase
function getElement() {
	return document.querySelector("label")
}

function compute(element) {
	let text = element.textContent.toLowerCase();
	let title = element.getAttribute("title").toLowerCase();
	return (text.includes(title) || title.includes(text))
}

compute(getElement())
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