JS: RegExp examples

index.js

const mail = "cocojaco@mail.fr";
const regex = new RegExp("^(\\w+)@(\\w+\\.\\w{2,4})$");

const mailOK = regex.test(mail);

const groups = regex.exec(mail);
const localPart = groups[1];
const domainPart = groups[2];


// ES6: email
const [ , local, domain ] = regex.exec(mail);

// ES6: American date format to Fr format
const [ , m, d, y ] = /(\d{2})-(\d{2})-(\d{4})/.exec("11-02-2017");
console.log(`${d}/${m}/${y}`)