1'use strict';
2
3var classof = require('./_classof');
4var builtinExec = RegExp.prototype.exec;
5
6 // `RegExpExec` abstract operation
7// https://tc39.github.io/ecma262/#sec-regexpexec
8module.exports = function (R, S) {
9  var exec = R.exec;
10  if (typeof exec === 'function') {
11    var result = exec.call(R, S);
12    if (typeof result !== 'object') {
13      throw new TypeError('RegExp exec method returned something other than an Object or null');
14    }
15    return result;
16  }
17  if (classof(R) !== 'RegExp') {
18    throw new TypeError('RegExp#exec called on incompatible receiver');
19  }
20  return builtinExec.call(R, S);
21};
22