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// Copyright (C) 2015 the V8 project authors. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
description: >
Substitution pattern: text before match
es6id: 21.2.5.8
info: |
16. Repeat, for each result in results,
[...]
m. If functionalReplace is true, then
[...]
n. Else,
i. Let replacement be GetSubstitution(matched, S, position,
captures, replaceValue).
[...]
21.1.3.14.1 Runtime Semantics: GetSubstitution
Code units: 0x0024, 0x0060
Unicode Characters: $`
Replacement text:
If position is 0, the replacement is the empty String. Otherwise the
replacement is the substring of str that starts at index 0 and whose last
code unit is at index `position-1`.
features: [Symbol.replace]
---*/
assert.sameValue(/a/ [Symbol.replace]('abc', '[$`]'), '[]bc');
assert.sameValue(/b/ [Symbol.replace]('abc', '[$`]'), 'a[a]c');
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