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Normative: Update GetSubstitution to match reality #3157

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Oct 12, 2023
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Normative: Update GetSubstitution to match reality #3157

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7 changes: 6 additions & 1 deletion spec.html
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Expand Up @@ -34929,11 +34929,16 @@ <h1>
1. NOTE: _tailPos_ can exceed _stringLength_ only if this abstract operation was invoked by a call to the intrinsic @@replace method of %RegExp.prototype% on an object whose *"exec"* property is not the intrinsic %RegExp.prototype.exec%.
1. Else if _templateRemainder_ starts with *"$"* followed by 1 or more decimal digits, then
1. If _templateRemainder_ starts with *"$"* followed by 2 or more decimal digits, let _digitCount_ be 2. Otherwise, let _digitCount_ be 1.
1. Let _ref_ be the substring of _templateRemainder_ from 0 to 1 + _digitCount_.
1. Let _digits_ be the substring of _templateRemainder_ from 1 to 1 + _digitCount_.
1. Let _index_ be ℝ(StringToNumber(_digits_)).
1. Assert: 0 ≤ _index_ ≤ 99.
1. Let _captureLen_ be the number of elements in _captures_.
1. If _index_ > _captureLen_ and _digitCount_ = 2, then
1. NOTE: When a two-digit replacement pattern specifies an index exceeding the count of capturing groups, it is treated as a one-digit replacement pattern followed by a literal digit.
1. Set _digitCount_ to 1.
1. Set _digits_ to the substring of _digits_ from 0 to 1.
1. Set _index_ to ℝ(StringToNumber(_digits_)).
1. Let _ref_ be the substring of _templateRemainder_ from 0 to 1 + _digitCount_.
1. If 1 ≤ _index_ ≤ _captureLen_, then
1. Let _capture_ be _captures_[_index_ - 1].
1. If _capture_ is *undefined*, then
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