InvalidOperationException: A highlighting span matched 0 characters, which would cause an endless loop.
Change the highlighting definition so that either the start or the end regex matches at least one character.
Start regex: (?=^)
End regex: $
StackTrace:
   在 ICSharpCode.AvalonEdit.Highlighting.HighlightingEngine.HighlightLineInternal()
   在 ICSharpCode.AvalonEdit.Highlighting.HighlightingEngine.HighlightLine(IDocument document, IDocumentLine line)
   在 ICSharpCode.AvalonEdit.Highlighting.DocumentHighlighter.HighlightLine(Int32 lineNumber)
   在 ICSharpCode.AvalonEdit.Highlighting.HighlightingColorizer.ColorizeLine(DocumentLine line)
   在 ICSharpCode.AvalonEdit.Rendering.DocumentColorizingTransformer.Colorize(ITextRunConstructionContext context)
   在 ICSharpCode.AvalonEdit.Highlighting.HighlightingColorizer.Colorize(ITextRunConstructionContext context)
   在 ICSharpCode.AvalonEdit.Rendering.ColorizingTransformer.Transform(ITextRunConstructionContext context, IList`1 elements)
   在 ICSharpCode.AvalonEdit.Rendering.VisualLine.RunTransformers(ITextRunConstructionContext context, IVisualLineTransformer[] transformers)
   在 ICSharpCode.AvalonEdit.Rendering.TextView.BuildVisualLine(DocumentLine documentLine, TextRunProperties globalTextRunProperties, VisualLineTextParagraphProperties paragraphProperties, VisualLineElementGenerator[] elementGeneratorsArray, IVisualLineTransformer[] lineTransformersArray, Size availableSize)
   在 ICSharpCode.AvalonEdit.Rendering.TextView.GetOrConstructVisualLine(DocumentLine documentLine)
   在 ICSharpCode.AvalonEdit.Editing.Caret.CalculateCaretRectangle()
   在 ICSharpCode.AvalonEdit.Editing.Caret.BringCaretToView(Double border)
   在 ICSharpCode.AvalonEdit.Editing.Caret.BringCaretToView()
   在 ICSharpCode.AvalonEdit.Editing.TextArea.PerformTextInput(TextCompositionEventArgs e)
   在 ICSharpCode.AvalonEdit.Editing.TextArea.PerformTextInput(String text)
   在 ICSharpCode.AvalonEdit.Editing.EditingCommandHandler.OnEnter(Object target, ExecutedRoutedEventArgs args)
   在 System.Windows.Input.CommandBinding.OnExecuted(Object sender, ExecutedRoutedEventArgs e)
   在 System.Windows.Input.CommandManager.ExecuteCommandBinding(Object sender, ExecutedRoutedEventArgs e, CommandBinding commandBinding)
   在 System.Windows.Input.CommandManager.FindCommandBinding(CommandBindingCollection commandBindings, Object sender, RoutedEventArgs e, ICommand command, Boolean execute)
   在 System.Windows.Input.CommandManager.FindCommandBinding(Object sender, RoutedEventArgs e, ICommand command, Boolean execute)
   在 System.Windows.Input.CommandManager.OnExecuted(Object sender, ExecutedRoutedEventArgs e)
   在 System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
   在 System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
   在 System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
   在 System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
   在 System.Windows.UIElement.RaiseTrustedEvent(RoutedEventArgs args)
   在 System.Windows.Input.RoutedCommand.ExecuteImpl(Object parameter, IInputElement target, Boolean userInitiated)
   在 System.Windows.Input.CommandManager.TranslateInput(IInputElement targetElement, InputEventArgs inputEventArgs)
   在 System.Windows.UIElement.OnKeyDownThunk(Object sender, KeyEventArgs e)
   在 System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
   在 System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
   在 System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
   在 System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
   在 System.Windows.UIElement.RaiseTrustedEvent(RoutedEventArgs args)
   在 System.Windows.Input.InputManager.ProcessStagingArea()
   在 System.Windows.Input.InputManager.ProcessInput(InputEventArgs input)
   在 System.Windows.Input.InputProviderSite.ReportInput(InputReport inputReport)
   在 System.Windows.Interop.HwndKeyboardInputProvider.ReportInput(IntPtr hwnd, InputMode mode, Int32 timestamp, RawKeyboardActions actions, Int32 scanCode, Boolean isExtendedKey, Boolean isSystemKey, Int32 virtualKey)
   在 System.Windows.Interop.HwndKeyboardInputProvider.ProcessKeyAction(MSG& msg, Boolean& handled)
   在 System.Windows.Interop.HwndSource.CriticalTranslateAccelerator(MSG& msg, ModifierKeys modifiers)
   在 System.Windows.Interop.HwndSource.OnPreprocessMessage(Object param)
   在 System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
   在 System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)