diff --git a/include/nameof.hpp b/include/nameof.hpp
index 2146497..6610134 100644
--- a/include/nameof.hpp
+++ b/include/nameof.hpp
@@ -477,9 +477,9 @@ constexpr string_view pretty_name(string_view name, bool remove_suffix = true) n
     name.remove_suffix(s);
   }
 
-  if (name.size() > 0 && ((name.front() >= 'a' && name.front() <= 'z') ||
-                          (name.front() >= 'A' && name.front() <= 'Z') ||
-                          (name.front() == '_'))) {
+  if (name.size() > 0 && ((name[0] >= 'a' && name[0] <= 'z') ||
+                          (name[0] >= 'A' && name[0] <= 'Z') ||
+                          (name[0] == '_'))) {
     return name;
   }
 
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 8be3ef8..85e098d 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -1,7 +1,5 @@
 include(CheckCXXCompilerFlag)
 
-set(SOURCES test.cpp)
-
 if(CMAKE_CXX_COMPILER_ID MATCHES "MSVC")
     set(OPTIONS /W4 /WX)
     check_cxx_compiler_flag(/permissive HAS_PERMISSIVE_FLAG)
@@ -10,16 +8,18 @@ if(CMAKE_CXX_COMPILER_ID MATCHES "MSVC")
     endif()
 
     check_cxx_compiler_flag(/std:c++20 HAS_CPP20_FLAG)
+    check_cxx_compiler_flag(/std:c++23 HAS_CPP23_FLAG)
     check_cxx_compiler_flag(/std:c++latest HAS_CPPLATEST_FLAG)
 elseif(CMAKE_CXX_COMPILER_ID MATCHES "GNU|Clang")
     set(CMAKE_VERBOSE_MAKEFILE ON)
     set(OPTIONS -Wall -Wextra -pedantic-errors -Werror)
 
     check_cxx_compiler_flag(-std=c++20 HAS_CPP20_FLAG)
+    check_cxx_compiler_flag(-std=c++23 HAS_CPP23_FLAG)
 endif()
 
-function(make_test target std)
-    add_executable(${target} ${SOURCES})
+function(make_test src target std)
+    add_executable(${target} ${src})
     target_compile_options(${target} PRIVATE ${OPTIONS})
     target_include_directories(${target} PRIVATE 3rdparty/Catch2)
     target_link_libraries(${target} PRIVATE ${CMAKE_PROJECT_NAME})
@@ -34,12 +34,20 @@ function(make_test target std)
     add_test(NAME ${target} COMMAND ${target})
 endfunction()
 
-make_test(${CMAKE_PROJECT_NAME}-cpp17.t c++17)
+make_test(test.cpp test-cpp17 c++17)
+make_test(test_aliases.cpp test_aliases-cpp17 c++17)
 
 if(HAS_CPP20_FLAG)
-    make_test(${CMAKE_PROJECT_NAME}-cpp20.t c++20)
+    make_test(test.cpp test-cpp20 c++20)
+    make_test(test_aliases.cpp test_aliases-cpp20 c++20)
+endif()
+
+if(HAS_CPP23_FLAG)
+    make_test(test.cpp test-cpp23 c++23)
+    make_test(test_aliases.cpp test_aliases-cpp23 c++23)
 endif()
 
 if(HAS_CPPLATEST_FLAG)
-    make_test(${CMAKE_PROJECT_NAME}-cpplatest.t c++latest)
+    make_test(test.cpp test-cpplatest c++latest)
+    make_test(test_aliases.cpp test_aliases-cpplatest c++latest)
 endif()
diff --git a/test/test_aliases.cpp b/test/test_aliases.cpp
new file mode 100644
index 0000000..354e38c
--- /dev/null
+++ b/test/test_aliases.cpp
@@ -0,0 +1,105 @@
+// Licensed under the MIT License <http://opensource.org/licenses/MIT>.
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2019 - 2022 Daniil Goncharov <neargye@gmail.com>.
+//
+// Permission is hereby  granted, free of charge, to any  person obtaining a copy
+// of this software and associated  documentation files (the "Software"), to deal
+// in the Software  without restriction, including without  limitation the rights
+// to  use, copy,  modify, merge,  publish, distribute,  sublicense, and/or  sell
+// copies  of  the Software,  and  to  permit persons  to  whom  the Software  is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE  IS PROVIDED "AS  IS", WITHOUT WARRANTY  OF ANY KIND,  EXPRESS OR
+// IMPLIED,  INCLUDING BUT  NOT  LIMITED TO  THE  WARRANTIES OF  MERCHANTABILITY,
+// FITNESS FOR  A PARTICULAR PURPOSE AND  NONINFRINGEMENT. IN NO EVENT  SHALL THE
+// AUTHORS  OR COPYRIGHT  HOLDERS  BE  LIABLE FOR  ANY  CLAIM,  DAMAGES OR  OTHER
+// LIABILITY, WHETHER IN AN ACTION OF  CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+#include <string>
+#include <string_view>
+
+#define CATCH_CONFIG_MAIN
+#include <catch.hpp>
+
+struct MyString {
+  MyString() : str{} {} // required
+  MyString(const char* s, std::size_t l) : str{s, l} {} // required
+  bool empty() const { return str.empty(); } // required
+  auto begin() const { return str.begin(); } // required
+  auto end() const { return str.end(); } // required
+  void append(std::size_t count, char c) { str.append(count, c); } // required
+  void append(const char* s, std::size_t size) { str.append(s, size); } // required
+
+  std::size_t size() const { return str.size(); }
+  int compare(const char* s) const { return str.compare(s); }
+
+ private:
+  std::string str;
+};
+
+struct MyStringView {
+  using value_type = char; // required
+  static constexpr auto npos = std::string_view::npos; // required
+
+  constexpr MyStringView() : str{} {} // required
+  constexpr MyStringView(const char* cstr, std::size_t size) : str{cstr, size} {} // required
+  constexpr bool empty() const { return str.empty(); } // required
+  constexpr std::size_t size() const { return str.size(); } // required
+  constexpr const char* data() const { return str.data(); } // required
+  constexpr const char& operator[](std::size_t i) const { return str[i]; } // required
+  constexpr auto begin() const { return str.begin(); } // required
+  constexpr auto end() const { return str.end(); } // required
+  constexpr std::size_t find(char c) const { return str.find(c); } // required
+  constexpr MyStringView substr(std::size_t p, std::size_t n) { return str.substr(p, n); } // required
+  constexpr void remove_prefix(std::size_t n) { str.remove_prefix(n); } // required
+  constexpr int compare(MyStringView s) const { return str.compare(s); } // required
+  friend constexpr bool operator==(MyStringView lhs, MyStringView rhs); // required
+
+  constexpr MyStringView(const char* cstr) : str{ cstr } {}
+  constexpr int compare(const char* s) const { return str.compare(s); }
+
+ private:
+  std::string_view str;
+
+  constexpr MyStringView(std::string_view s) : str{s} {}
+};
+
+constexpr bool operator==(MyStringView lhs, MyStringView rhs) {
+  return lhs.str == rhs.str;
+}
+
+#define NAMEOF_USING_ALIAS_STRING using string = MyString;
+#define NAMEOF_USING_ALIAS_STRING_VIEW using string_view = MyStringView;
+
+#include <nameof.hpp>
+
+enum class Color { RED = 1, GREEN = 2, BLUE = 4 };
+
+TEST_CASE("string") {
+  auto cr = nameof::nameof_enum_flag(Color::RED);
+  REQUIRE_FALSE(cr.empty());
+  REQUIRE(cr.compare("RED") == 0);
+
+  auto crg = nameof::nameof_enum_flag(static_cast<Color>(1 | 2));
+  REQUIRE_FALSE(crg.empty());
+  REQUIRE(crg.compare("RED|GREEN") == 0);
+
+  auto cn = nameof::nameof_enum_flag(Color{0});
+  REQUIRE(cn.empty());
+  REQUIRE(cn.size() == 0);
+}
+
+TEST_CASE("string_view") {
+  auto cr = nameof::nameof_enum(Color::RED);
+  REQUIRE_FALSE(cr.empty());
+  REQUIRE(cr.compare("RED") == 0);
+
+  auto cn = nameof::nameof_enum(Color{0});
+  REQUIRE(cn.empty());
+  REQUIRE(cn.size() == 0);
+}