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:
   at ICSharpCode.AvalonEdit.Highlighting.HighlightingEngine.HighlightLineInternal()
   at ICSharpCode.AvalonEdit.Highlighting.HighlightingEngine.HighlightLine(IDocument document, IDocumentLine line)
   at ICSharpCode.AvalonEdit.Highlighting.DocumentHighlighter.HighlightLine(Int32 lineNumber)
   at ICSharpCode.AvalonEdit.Highlighting.HighlightingColorizer.ColorizeLine(DocumentLine line)
   at ICSharpCode.AvalonEdit.Rendering.DocumentColorizingTransformer.Colorize(ITextRunConstructionContext context)
   at ICSharpCode.AvalonEdit.Highlighting.HighlightingColorizer.Colorize(ITextRunConstructionContext context)
   at ICSharpCode.AvalonEdit.Rendering.ColorizingTransformer.Transform(ITextRunConstructionContext context, IList`1 elements)
   at ICSharpCode.AvalonEdit.Rendering.VisualLine.RunTransformers(ITextRunConstructionContext context, IVisualLineTransformer[] transformers)
   at ICSharpCode.AvalonEdit.Rendering.TextView.BuildVisualLine(DocumentLine documentLine, TextRunProperties globalTextRunProperties, VisualLineTextParagraphProperties paragraphProperties, VisualLineElementGenerator[] elementGeneratorsArray, IVisualLineTransformer[] lineTransformersArray, Size availableSize)
   at ICSharpCode.AvalonEdit.Rendering.TextView.CreateAndMeasureVisualLines(Size availableSize)
   at ICSharpCode.AvalonEdit.Rendering.TextView.MeasureOverride(Size availableSize)
   at System.Windows.FrameworkElement.MeasureCore(Size availableSize)
   at System.Windows.UIElement.Measure(Size availableSize)
   at System.Windows.ContextLayoutManager.UpdateLayout()
   at System.Windows.ContextLayoutManager.UpdateLayoutCallback(Object arg)
   at System.Windows.Media.MediaContext.FireInvokeOnRenderCallbacks()
   at System.Windows.Media.MediaContext.RenderMessageHandlerCore(Object resizedCompositionTarget)
   at System.Windows.Media.MediaContext.RenderMessageHandler(Object resizedCompositionTarget)
   at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
   at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)