diff --git a/Bloxstrap/Resources/Strings.resx b/Bloxstrap/Resources/Strings.resx
index b5eadc2..c749c3d 100644
--- a/Bloxstrap/Resources/Strings.resx
+++ b/Bloxstrap/Resources/Strings.resx
@@ -1021,4 +1021,7 @@ Selecting 'No' will ignore this warning and continue installation.</value>
   <data name="Common.SystemDefault" xml:space="preserve">
     <value>System default</value>
   </data>
+  <data name="Menu.FastFlagEditor.InvalidPlaceFilter" xml:space="preserve">
+    <value>The entry for '{0}' is not valid as the place filter is not formatted correctly.</value>
+  </data>
 </root>
\ No newline at end of file
diff --git a/Bloxstrap/UI/Elements/Menu/Pages/FastFlagEditorPage.xaml.cs b/Bloxstrap/UI/Elements/Menu/Pages/FastFlagEditorPage.xaml.cs
index d7d5cf0..4542ca2 100644
--- a/Bloxstrap/UI/Elements/Menu/Pages/FastFlagEditorPage.xaml.cs
+++ b/Bloxstrap/UI/Elements/Menu/Pages/FastFlagEditorPage.xaml.cs
@@ -22,9 +22,15 @@ namespace Bloxstrap.UI.Elements.Menu.Pages
         private readonly ObservableCollection<FastFlag> _fastFlagList = new();
         private readonly List<string> _validPrefixes = new()
         {
-            "FFlag", "DFFlag", "SFFlag", "FInt", "DFInt", "FString", "DFString", "FLog", "DFlog"
+            "FFlag", "DFFlag", "SFFlag", "FInt", "DFInt", "FString", "DFString", "FLog", "DFLog"
         };
 
+        // values must match the entire string to avoid cases where half the string
+        // matches but the filter would still be invalid
+        private readonly Regex _boolFilterPattern = new("(?:true|false)(;[\\d]{1,})+$");
+        private readonly Regex _intFilterPattern = new("([\\d]{1,})?(;[\\d]{1,})+$");
+        private readonly Regex _stringFilterPattern = new("^[^;]*(;[\\d]{1,})+$");
+
         private bool _showPresets = false;
         private string _searchFilter = "";
 
@@ -253,17 +259,22 @@ namespace Bloxstrap.UI.Elements.Menu.Pages
             string lowerValue = value.ToLowerInvariant();
             string errorMessage = "";
 
-            if (!_validPrefixes.Where(x => name.StartsWith(x)).Any())
+            if (!_validPrefixes.Any(name.StartsWith))
                 errorMessage = Bloxstrap.Resources.Strings.Menu_FastFlagEditor_InvalidPrefix;
             else if (!name.All(x => char.IsLetterOrDigit(x) || x == '_'))
                 errorMessage = Bloxstrap.Resources.Strings.Menu_FastFlagEditor_InvalidCharacter;
+            
+            // sorry
+            if (name.EndsWith("_PlaceFilter") || name.EndsWith("_DataCenterFilter"))
+                errorMessage = !Validate_Filter(name, value) ? Bloxstrap.Resources.Strings.Menu_FastFlagEditor_InvalidPlaceFilter : ""; 
             else if ((name.StartsWith("FInt") || name.StartsWith("DFInt")) && !Int32.TryParse(value, out _))
                 errorMessage = Bloxstrap.Resources.Strings.Menu_FastFlagEditor_InvalidNumberValue;
             else if ((name.StartsWith("FFlag") || name.StartsWith("DFFlag")) && lowerValue != "true" && lowerValue != "false")
                 errorMessage = Bloxstrap.Resources.Strings.Menu_FastFlagEditor_InvalidBoolValue;
 
+            
             if (!String.IsNullOrEmpty(errorMessage))
-            {
+            { 
                 Frontend.ShowMessageBox(String.Format(errorMessage, name), MessageBoxImage.Error);
                 return false;
             }
@@ -271,6 +282,18 @@ namespace Bloxstrap.UI.Elements.Menu.Pages
             return true;
         }
 
+        private bool Validate_Filter(string name, string value)
+        {
+            if(name.StartsWith("FFlag") || name.StartsWith("DFFlag"))
+                return _boolFilterPattern.IsMatch(value);
+            if (name.StartsWith("FInt") || name.StartsWith("DFInt"))
+                return _intFilterPattern.IsMatch(value);
+            if (name.StartsWith("FString") || name.StartsWith("DFString") || name.StartsWith("FLog") || name.StartsWith("DFLog"))
+                return _stringFilterPattern.IsMatch(value);
+            
+            return false;
+        }
+
         // refresh list on page load to synchronize with preset page
         private void Page_Loaded(object sender, RoutedEventArgs e) => ReloadList();