diff --git a/include/stdex/string.hpp b/include/stdex/string.hpp
index 9f95c1032..1cb19db66 100644
--- a/include/stdex/string.hpp
+++ b/include/stdex/string.hpp
@@ -147,6 +147,17 @@ namespace stdex
 		return chr == ' ' || chr == '\t' || chr == '\n' || chr == '\r' || chr == '\v' || chr == '\f';
 	}
 
+	///
+	/// Test if the given code unit is ASCII-punctuation
+	///
+	/// \param[in] chr  Code unit
+	///
+	template <class T>
+	bool ispunct(_In_ T chr)
+	{
+		return ('!' <= chr && chr <= '/') || (':' <= chr && chr <= '@') || ('[' <= chr && chr <= '`') || ('{' <= chr && chr <= '~');
+	}
+
 	///
 	/// Test if the given code unit is ASCII-lower-case-character
 	///