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Avoid character classification in regex escape parsing.

Jeff Davis <jdavis@postgresql.org>

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Commit: c04c6c5d6f5f213f217f1e356bf1c2d8b4e255a2
Author: Jeff Davis <jdavis@postgresql.org>
Date: 2023-04-21T15:19:41Z
Releases: 16.0 
Avoid character classification in regex escape parsing.

For regex escape sequences, just test directly for the relevant ASCII
characters rather than using locale-sensitive character
classification.

This fixes an assertion failure when a locale considers a non-ASCII
character, such as "൧", to be a digit.

Reported-by: Richard Guo
Discussion: https://postgr.es/m/CAMbWs49Q6UoKGeT8pBkMtJGJd+16CBFZaaWUk9Du+2ERE5g_YA@mail.gmail.com
Backpatch-through: 11

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PathChange+/−
src/backend/regex/regc_lex.c modified +10 −3

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