[libc++][C++03] Cherry-pick #148231

[philnik777]

No description provided.

[llvmbot]

@llvm/pr-subscribers-libcxx

Author: Nikolas Klauser (philnik777)

Changes

---

Full diff: https://github.com/llvm/llvm-project/pull/163360.diff

2 Files Affected:

• (modified) libcxx/include/__cxx03/regex (+1-1)
• (modified) libcxx/test/std/re/re.regex/re.regex.construct/bad_range.pass.cpp (-2)

diff --git a/libcxx/include/__cxx03/regex b/libcxx/include/__cxx03/regex
index f4e662d283cb9..b6a78f27fbd37 100644
--- a/libcxx/include/__cxx03/regex
+++ b/libcxx/include/__cxx03/regex
@@ -2100,7 +2100,7 @@ public:
       __ranges_.push_back(
           std::make_pair(__traits_.transform(__b.begin(), __b.end()), __traits_.transform(__e.begin(), __e.end())));
     } else {
-      if (__b.size() != 1 || __e.size() != 1)
+      if (__b.size() != 1 || __e.size() != 1 || char_traits<typename string_type::value_type>::lt(__e[0], __b[0]))
         __throw_regex_error<regex_constants::error_range>();
       if (__icase_) {
         __b[0] = __traits_.translate_nocase(__b[0]);
diff --git a/libcxx/test/std/re/re.regex/re.regex.construct/bad_range.pass.cpp b/libcxx/test/std/re/re.regex/re.regex.construct/bad_range.pass.cpp
index ecfdaee2eed66..cabd9ebec520e 100644
--- a/libcxx/test/std/re/re.regex/re.regex.construct/bad_range.pass.cpp
+++ b/libcxx/test/std/re/re.regex/re.regex.construct/bad_range.pass.cpp
@@ -14,8 +14,6 @@
 // template <class ST, class SA>
 //    basic_regex(const basic_string<charT, ST, SA>& s);
 
-// XFAIL: FROZEN-CXX03-HEADERS-FIXME
-
 #include <regex>
 #include <cassert>
 #include "test_macros.h"