function getFlags(re) {
var text = re.toString();
return text.substring(text.lastIndexOf("/") + 1, text.length);
}
// toString() is "/ab/g"
var re = /ab/g;
console.log(getFlags(re)); // "g"
let re = /ab/g;
console.log(re.source); // "ab"
console.log(re.flags); // "g"
ES6
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