v8/test/mjsunit/es6/string-match.js

// Copyright 2015 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

const pattern = {};
pattern[Symbol.match] = function(string) {
  return string.length;
};
// Check object coercible fails.
assertThrows(() => String.prototype.match.call(null, pattern),
             TypeError);
// Override is called.
assertEquals(5, "abcde".match(pattern));
// Receiver is not converted to string if pattern has Symbol.match
const receiver = { toString(){ throw new Error(); }, length: 6 };
assertEquals(6, String.prototype.match.call(receiver, pattern));
// Non-callable override.
pattern[Symbol.match] = "dumdidum";
assertThrows(() => "abcde".match(pattern), TypeError);

assertEquals("[Symbol.match]", RegExp.prototype[Symbol.match].name);