diff --git a/nel/include/nel/misc/common.h b/nel/include/nel/misc/common.h
index bca3372bd..1e99b5e70 100644
--- a/nel/include/nel/misc/common.h
+++ b/nel/include/nel/misc/common.h
@@ -255,6 +255,17 @@ int compareCaseInsensitive(const char *a, const char *b);
 int compareCaseInsensitive(const char *a, size_t lenA, const char *b, size_t lenB);
 inline int compareCaseInsensitive(const std::string &a, const std::string &b) { return compareCaseInsensitive(&a[0], a.size(), &b[0], b.size()); }
 
+/** ASCII to lowercase. Useful for internal identifiers.
+* Characters outside of the 7-bit ASCII space, and control characters, are replaced.
+*/
+std::string toLowerAscii(const std::string &str, char replacement);
+void toLowerAscii(char *str, char replacement);
+
+/** ASCII to uppercase. Useful for internal identifiers.
+* Characters outside of the 7-bit ASCII space, and control characters, are replaced.
+*/
+std::string toUpperAscii(const std::string &str, char replacement);
+void toUpperAscii(char *str, char replacement);
 
 /**
  *  Convert to an hexadecimal std::string
diff --git a/nel/src/misc/common.cpp b/nel/src/misc/common.cpp
index 8d046c97c..fce6af69c 100644
--- a/nel/src/misc/common.cpp
+++ b/nel/src/misc/common.cpp
@@ -689,6 +689,56 @@ void toUpper(char *str)
 	}
 }
 
+std::string toLowerAscii(const std::string &str, char replacement)
+{
+	std::string res;
+	res.reserve(str.size());
+	for (std::string::const_iterator it(str.begin()), end(str.end()); it != end; ++it)
+	{
+		char c = *it;
+		if ((sint8)(c + '\x01') < (sint8)(' ' + '\x01')) res += replacement;
+		else if (c >= 'A' && c <= 'Z') res += c + ('a' - 'A');
+		else res += c;
+	}
+	return res;
+}
+
+void toLowerAscii(char *str, char replacement)
+{
+	for (ptrdiff_t i = 0; str[i]; ++i)
+	{
+		char c = str[i];
+		if ((sint8)(c + '\x01') < (sint8)(' ' + '\x01')) str[i] = replacement;
+		else if (c >= 'A' && c <= 'Z') str[i] = c + ('a' - 'A');
+		else str[i] = c;
+	}
+}
+
+std::string toUpperAscii(const std::string &str, char replacement)
+{
+	std::string res;
+	res.reserve(str.size());
+	for (std::string::const_iterator it(str.begin()), end(str.end()); it != end; ++it)
+	{
+		char c = *it;
+		if ((sint8)(c + '\x01') < (sint8)(' ' + '\x01')) res += replacement;
+		else if (c >= 'a' && c <= 'z') res += c - ('a' - 'A');
+		else res += c;
+	}
+	return res;
+}
+
+void toUpperAscii(char *str, char replacement)
+{
+	for (ptrdiff_t i = 0; str[i]; ++i)
+	{
+		char c = str[i];
+		if ((sint8)(c + '\x01') < (sint8)(' ' + '\x01')) str[i] = replacement;
+		else if (c >= 'a' && c <= 'z') str[i] = c - ('a' - 'A');
+		else str[i] = c;
+	}
+}
+
 std::string toHexa(const uint8 &b)
 {
 	return toString("%02hhx", b);