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LibJS: Behave like major engines when substituting missing capture group
When a substitution refers to a 2-digit capture group that doesn't exist we need to check if the first digit refers to an existing capture group. In other words, '$10' should be treated as capture group #1, followed by the literal '0' if 1 is a valid capture group but 10 is not. This makes the Dromaeo "dom-query" subtest run to completion.
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@ -1269,6 +1269,15 @@ ThrowCompletionOr<String> get_substitution(VM& vm, Utf16View const& matched, Utf
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auto capture_position_string = TRY_OR_THROW_OOM(vm, replace_view.substring_view(i + 1, is_two_digits ? 2 : 1).to_utf8());
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auto capture_position = capture_position_string.to_number<u32>();
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// NOTE: All major engines treat $10 as $1 followed by a literal '0' character
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// if there are fewer than 10 capture groups. The spec disagrees.
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// Spec bug: https://github.com/tc39/ecma262/issues/1426
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if (is_two_digits && capture_position.has_value() && (*capture_position > 0) && (*capture_position > captures.size())) {
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is_two_digits = false;
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capture_position_string = MUST(capture_position_string.substring_from_byte_offset(0, 1));
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capture_position = capture_position_string.to_number<u32>();
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}
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if (capture_position.has_value() && (*capture_position > 0) && (*capture_position <= captures.size())) {
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auto& value = captures[*capture_position - 1];
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