# Demo

---

````javascript
var RegExplus = require('regexplus');

var reg = /(\d{4})(\d+)(?=\d{4})/;
console.log(reg.exec('1234567890'));

var r = /a/ig;
var m;
while(m = r.exec('aAaA')) {
  console.log("R", RegExp, RegExp.lastIndex, RegExp.index);
  console.log("M", m, m.lastIndex, m.index);
  console.log("r", r, r.lastIndex, r.index);
}
````