diff --git a/NSBin/Rmod.cs b/NSBin/Rmod.cs
index 13b658b..6e0b115 100644
--- a/NSBin/Rmod.cs
+++ b/NSBin/Rmod.cs
@@ -71,8 +71,8 @@ public static bool IsValidNS(string name)
                 return true;
             }
 
-            return Regex.IsMatch(name, "^[a-z_][a-z_0-9.]*$", RegexOptions.IgnoreCase)
-                    && !Regex.IsMatch(name, @"(?:\.(\s*\.)+|\.\s*$)"); //  left. ...  .right.
+            return Regex.IsMatch(name, @"^[^0-9\W][.\w]*$")
+                && !Regex.IsMatch(name, @"(?:\.(\s*\.)+|\.\s*$)"); //  left. ...  .right.
         }
 
         public void setNamespace(string name, bool viaCecil, bool preparing)
diff --git a/NSBinTest/DDNSTest.cs b/NSBinTest/DDNSTest.cs
index 7d5cc8b..d5eebde 100644
--- a/NSBinTest/DDNSTest.cs
+++ b/NSBinTest/DDNSTest.cs
@@ -11,18 +11,47 @@ public class DDNSTest
         public void nsTest1()
         {
             Assert.AreEqual(true, DDNS.IsValidNS("net.r_eg.DllExport"));
-            Assert.AreEqual(false, DDNS.IsValidNS("net.r_eg..DllExport"));
+            Assert.AreEqual(true, DDNS.IsValidNS("  "));
+            Assert.AreEqual(true, DDNS.IsValidNS(" "));
+            Assert.AreEqual(true, DDNS.IsValidNS(null));
+            Assert.AreEqual(true, DDNS.IsValidNS(String.Empty));
+        }
+
+        [TestMethod]
+        public void nsTest2()
+        {
             Assert.AreEqual(false, DDNS.IsValidNS("net.r-eg.DllExport"));
             Assert.AreEqual(false, DDNS.IsValidNS("net.  r_eg  .   DllExport"));
             Assert.AreEqual(false, DDNS.IsValidNS("net.r_eg.DllExport."));
-            Assert.AreEqual(false, DDNS.IsValidNS("0net.r_eg.DllExport"));
+            Assert.AreEqual(false, DDNS.IsValidNS("1net.r_eg.DllExport"));
+            
+            Assert.AreEqual(false, DDNS.IsValidNS("net.r_eg..DllExport"));
             Assert.AreEqual(false, DDNS.IsValidNS(".net.r_eg.DllExport"));
 
-            Assert.AreEqual(true, DDNS.IsValidNS("  "));
-            Assert.AreEqual(true, DDNS.IsValidNS(null));
-            Assert.AreEqual(true, DDNS.IsValidNS(String.Empty));
+            Assert.AreEqual(true, DDNS.IsValidNS("_net.r_eg.DllExport"));
         }
 
+        [TestMethod]
+        public void nsTest3()
+        {
+            // https://github.com/3F/DllExport/issues/61#issuecomment-352804273
+
+            Assert.AreEqual(true, DDNS.IsValidNS("あいうえおかきくけこ"));
+            Assert.AreEqual(true, DDNS.IsValidNS("中文解决方案名称"));
+            Assert.AreEqual(true, DDNS.IsValidNS("あいうえおかきくけこ.DllExport"));
+            Assert.AreEqual(true, DDNS.IsValidNS("中文解决方案名称.DllExport"));
+
+            Assert.AreEqual(true, DDNS.IsValidNS("Проверка"));
+            Assert.AreEqual(true, DDNS.IsValidNS("Проверка.DllExport"));
+
+            Assert.AreEqual(false, DDNS.IsValidNS("0あいうえおかきくけこ"));
+            Assert.AreEqual(false, DDNS.IsValidNS("0中文解决方案名称"));
+            Assert.AreEqual(false, DDNS.IsValidNS("0あいうえおかきくけこ.DllExport"));
+            Assert.AreEqual(false, DDNS.IsValidNS("0中文解决方案名称.DllExport"));
+
+            Assert.AreEqual(false, DDNS.IsValidNS("0Проверка"));
+            Assert.AreEqual(false, DDNS.IsValidNS("0Проверка.DllExport"));
+        }
 
     }
 }