diff --git a/source/mijin/util/string.hpp b/source/mijin/util/string.hpp
index d830af5..5dab3cf 100644
--- a/source/mijin/util/string.hpp
+++ b/source/mijin/util/string.hpp
@@ -387,6 +387,15 @@ constexpr bool isHexadecimalChar(TChar chr) noexcept
         || (chr >= TChar('a') && chr <= TChar('f'));
 }
 
+[[nodiscard]]
+inline auto findIgnoreCase(std::string_view haystack, std::string_view needle)
+{
+    return std::ranges::search(haystack, needle, [](char left, char right)
+    {
+        return std::tolower(left) == std::tolower(right);
+    });
+}
+
 namespace pipe
 {
 struct Join