Javascript match all substring instances via regex and return array

script.js

const htmlString = "Normal normal <u>souligné</u> normal normal <u>souligné</u>";
const regex = /<u>(.+?)<\/u>/g;
let matches;
const results = [];

while ((matches = regex.exec(htmlString)) !== null) {
    results.push({
        match: matches[1],
        index: matches.index
    });
}

console.log(results);