code: function (R, S) {
    var exec = R.exec;
    if (typeof exec === 'function') {
      var result = exec.call(R, S);
      if (typeof result !== 'object') {
        throw TypeError('RegExp exec method returned something other than an Object or null');
      }
      return result;
    }
  
    if (classofRaw(R) !== 'RegExp') {
      throw TypeError('RegExp#exec called on incompatible receiver');
    }
  
    return regexpExec.call(R, S);
  }
docs: `RegExpExec` abstract operation https://tc39.github.io/ecma262/#sec-regexpexec