JavaScript - Get the index of each word that matches the search.

getAllIndexText()

const getAllIndexText = (str, letter, caseSensitive = false) => {
    //all lowercase letters
    if (caseSensitive) {
        str    = str.toLowerCase();
        letter = letter.toLowerCase();
    }
    let arPosition = [];
    while (str.indexOf(letter) > -1) {
        arPosition.push(str.indexOf(letter));
        str = str.replace(letter, '__');
    }
    return arPosition;
};

let arIndex = getAllIndexText("Un tete a tete con Tete", "te", true);

console.log(arIndex); //[ 3, 5, 10, 12, 19, 21 ]