chakra-core/ChakraCore

[RegExp] Unicode-mode RegExp incorrectly matches lone surrogates

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#98 创建于 2016年1月14日

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 (2 评论) (0 反应) (0 负责人)JavaScript (9,000 star) (1,374 fork)batch import
BugSeverity: 2help wanted

描述

I was able to observe this in Edge 25.10586.0.0:

/[\ud800-\ud805]+/u.exec("\u{10000}\ud801\ud802") should return ["\ud801\ud802] but instead returns["\ud800"], which is the first half of "\u{10000}".

The spec requires the input string to be interpreted as a sequence of code points, i.e. surrogate pairs to be combined. So matching the lead surrogate of "\u{10000}" is incorrect.

A bit more reduced would be: /\ud800+/u.exec("\u{10000}") should return null, but returns ["\ud800"] instead.

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javascript
领域
backend
议题类型
bug
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前置要求
JavaScript fundamentalsUnicode basicsRegular expressions
新手友好度1-100 的估计分数，表示该议题对首次贡献者的友好程度。
65
研究方向
Investigate the RegExp Unicode mode implementation in ChakraCore. Focus on how the engine handles surrogate pairs in the input string when matching patterns. Look at the exec method and the character class range logic to ensure that lone surrogates are not incorrectly matched. The bug may be in the step that interprets the input string as code points; ensure surrogate pairs are combined before matching.