diff --git a/AscNet.GameServer/Commands/Command.cs b/AscNet.GameServer/Commands/Command.cs
index 3033475..eb2c142 100644
--- a/AscNet.GameServer/Commands/Command.cs
+++ b/AscNet.GameServer/Commands/Command.cs
@@ -58,14 +58,19 @@ namespace AscNet.GameServer.Commands
     public class ArgumentAttribute : Attribute
     {
         public int Position { get; }
-        public Regex Pattern { get; }
+        public Regex Pattern { get; set; }
         public string? Description { get; }
         public ArgumentFlags Flags { get; }
 
         public ArgumentAttribute(int position, string pattern, string? description = null, ArgumentFlags flags = ArgumentFlags.None)
         {
             Position = position;
-            Pattern = new(pattern);
+
+            if ((flags & ArgumentFlags.IgnoreCase) != ArgumentFlags.IgnoreCase)
+                Pattern = new(pattern);
+            else
+                Pattern = new(pattern, RegexOptions.IgnoreCase);
+
             Description = description;
             Flags = flags;
         }
@@ -74,7 +79,8 @@ namespace AscNet.GameServer.Commands
     public enum ArgumentFlags
     {
         None = 0,
-        Optional = 1
+        Optional = 1,
+        IgnoreCase = 2
     }
 
     [AttributeUsage(AttributeTargets.Class)]
diff --git a/AscNet.GameServer/Commands/ItemCommand.cs b/AscNet.GameServer/Commands/ItemCommand.cs
index a1ef14c..0337094 100644
--- a/AscNet.GameServer/Commands/ItemCommand.cs
+++ b/AscNet.GameServer/Commands/ItemCommand.cs
@@ -11,7 +11,7 @@ namespace AscNet.GameServer.Commands
 
         public override string Help => "Command to interact with user's items";
 
-        [Argument(0, @"^add$|^clear$|^reset$", "The operation selected (add, clear, reset)")]
+        [Argument(0, @"^add$|^clear$|^reset$", "The operation selected (add, clear, reset)", ArgumentFlags.IgnoreCase)]
         string Op { get; set; } = string.Empty;
 
         [Argument(1, @"^[0-9]+$|^all$", "The target item, value is item id or 'all'", ArgumentFlags.Optional)]
@@ -22,7 +22,7 @@ namespace AscNet.GameServer.Commands
 
         public override void Execute()
         {
-            switch (Op)
+            switch (Op.ToLower())
             {
                 case "add":
                     if (Target == "all")