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B.1.4 AtomEscape production syntax incomplete #378

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hashseed opened this issue Feb 10, 2016 · 2 comments
Closed

B.1.4 AtomEscape production syntax incomplete #378

hashseed opened this issue Feb 10, 2016 · 2 comments

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@hashseed
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In http://tc39.github.io/ecma262/#sec-regular-expressions-patterns

AtomEscape[U] ::
[+U] DecimalEscape
[+U] CharacterEscape[U]
[+U] CharacterClassEscape
[~U] DecimalEscape only if the integer value
[~U] CharacterClassEscape
[~U] CharacterEscape

It should be

AtomEscape[U] ::
[+U] DecimalEscape
[+U] CharacterEscape[U]
[+U] CharacterClassEscape
[~U] DecimalEscape but only if the integer value of DecimalEscape is <= NCapturingParens
[~U] CharacterClassEscape
[~U] CharacterEscape

The condition for ~U is necessary so that we can fall back to CharacterEscape, which may interpret the digits as legacy octal escape.
@michaelficarra
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This seems to be another duplicate of #363, #358, #325.

@bterlson
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Indeed, same issue.

This was referenced Feb 24, 2022
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This was referenced Dec 20, 2023
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@bterlson @michaelficarra @hashseed