<regex>: Restrict control letters in escapes to alphabetic ASCII characters
#5524
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muellerj2
commented
May 18, 2025
StephanTLavavej
added
bug
StephanTLavavej
approved these changes
May 20, 2025
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Thanks! 😻 I pushed minor changes, please meow if I was confused. |
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I'm mirroring this to the MSVC-internal repo - please notify me if any further changes are pushed. |
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There is no escape for regex bugs! 😹 🤪 🤣 |
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Towards #995. ECMAScript 15.10.1 defines the production
ControlLettersuch that only ASCII alphabetic characters are allowed. Such restricted character sets are often extended to corresponding POSIX character classes (to include Unicode characters) by Boost.Regex or<regex>implementations. But such an extension doesn't make much sense in this specific case, because these\c+ letter escapes are supposed to emulate what pressing Ctrl + ASCII character does in the terminal. (It would actually make more sense to support "\c[" and similar, but the ECMAScript standard doesn't say so.)Alternative: If non-ASCII characters should remain supported, we could query the bitmask of the character class "alpha" from the traits class.