[libcxx-commits] [libcxx] [regex] fix uncaught exception when string is like "\\_" (PR #129348)

[via libcxx-commits]

https://github.com/Zhenhang1213 created https://github.com/llvm/llvm-project/pull/129348

fixes #129062

>From e111bf7967f4159a829f3b4161788d1b39f59949 Mon Sep 17 00:00:00 2001
From: Austin <zhenhangwang at huawei.com>
Date: Sat, 1 Mar 2025 10:37:20 +0800
Subject: [PATCH] [regex] fix uncaught exception when string is like "\\_"

fixes #129062
---
 libcxx/include/regex | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libcxx/include/regex b/libcxx/include/regex
index 36ea55ce30921..6916f91628821 100644
--- a/libcxx/include/regex
+++ b/libcxx/include/regex
@@ -3954,7 +3954,7 @@ _ForwardIterator basic_regex<_CharT, _Traits>::__parse_character_escape(
       ++__first;
       break;
     default:
-      if (*__first != '_' && !__traits_.isctype(*__first, ctype_base::alnum)) {
+      if (!__traits_.isctype(*__first, ctype_base::alnum)) {
         if (__str)
           *__str = *__first;
         else