text: // 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: two-digit capturing group reference
  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, N, N
      Where 0x0030 ≤ N ≤ 0x0039
  
      Unicode Characters:
      $nn where
      n is one of 0 1 2 3 4 5 6 7 8 9
  
      Replacement text:
      The nnth element of captures, where nn is a two-digit decimal number in the
      range 01 to 99. If nn≤m and the nnth element of captures is undefined, use
      the empty String instead. If nn is 00 or nn>m, no replacement is done.
  features: [Symbol.replace]
  ---*/
  
  assert.sameValue(
    /b(c)(z)?(.)/[Symbol.replace]('abcde', '[$01$02$03]'), 'a[cd]e'
  );
  
  assert.sameValue(
    /b(c)(z)?(.)/[Symbol.replace]('abcde', '[$01$02$03$04$00]'), 'a[cd$04$00]e'
  );
  