JSTests/test262/test/annexB/built-ins/RegExp/prototype/compile/pattern-string.js

// Copyright (C) 2016 the V8 project authors. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-regexp.prototype.compile
es6id: B.2.5.1
description: >
    Behavior when pattern is a string describing a valid pattern (non-unicode)
info: |
    [...]
    5. Return ? RegExpInitialize(O, P, F).

    21.2.3.2.2 Runtime Semantics: RegExpInitialize

    6. If F contains "u", let BMP be false; else let BMP be true.
    7. If BMP is true, then
       [...]
    8. Else,
       a. Parse P using the grammars in 21.2.1 and interpreting P as UTF-16
          encoded Unicode code points (6.1.4). The goal symbol for the parse is
          Pattern[U]. Throw a SyntaxError exception if P did not conform to the
          grammar, if any elements of P were not matched by the parse, or if
          any Early Error conditions exist.
       b. Let patternCharacters be a List whose elements are the code points
          resulting from applying UTF-16 decoding to P's sequence of elements.
    [...]
---*/

var subject = /original value/ig;

subject.compile('new value');

assert.sameValue(
  subject.source,
  new RegExp('new value').source,
  '[[OriginalSource]] internal slot'
);
assert.sameValue(
  subject.test('original value'), false, '[[RegExpMatcher]] internal slot'
);
assert.sameValue(
  subject.test('new value'), true, '[[RegExpMatcher]] internal slot'
);