Count characters in DOM element with case sensitive option

count-character.js

/**
* Search number of times a character/string exist in DOM element 
*
* @name countCharacter
* @param DOMElement {String|Object} - DOM element you want count characters inside
* @param character {String} - String you want count
* @param caseSensitive {Boolean} - Option to set sensitive to uppercase or lowercase
* @return {Number} - Total of times character match in DOM element
**/
function countCharacter(DOMElement = 'body', character = '', caseSensitive = false) {
    const element = (typeof DOMElement === 'string') ?  document.querySelector(DOMElement) : DOMElement;
    const text = element.innerText;
    const option = caseSensitive ? 'g' : 'gi';
    return text.match(new RegExp(character, option)).length;
}