diff --git a/PCAxis.Sql/ApiUtils/ApiUtil.cs b/PCAxis.Sql/ApiUtils/ApiUtil.cs
index 382ec78..6a9086c 100644
--- a/PCAxis.Sql/ApiUtils/ApiUtil.cs
+++ b/PCAxis.Sql/ApiUtils/ApiUtil.cs
@@ -97,9 +97,9 @@ private static string ValidateIdString(string input)
                 throw new ArgumentException("The id string cannot be null.");
             }
 
-            if (!Regex.IsMatch(input, @"^[a-zA-Z0-9._\s]+$", RegexOptions.None, TimeSpan.FromSeconds(2)))
+            if (!Regex.IsMatch(input, @"^[\w\t \-:.]+$", RegexOptions.None, TimeSpan.FromSeconds(2)))
             {
-                throw new ArgumentException("The string contains invalid characters. Only digits, letters, underscores, periods and spaces are allowed.");
+                throw new ArgumentException("The string contains invalid characters. Only letters, digits, underscores, tabs, spaces, hyphens, colons and periods are allowed.");
             }
             return input;
         }