This is a fork of the .Net 6 conversion of Pavel's Fast Colored TextBox. This fork builds on the existing Textbox to add new features, such as unlimited text styling, a blinking text style and text block indentation guides. (I still have to merge these features into this fork, but they will be present shortly)
Fast Colored TextBox is text editor component for .NET. Allows you to create custom text editor with syntax highlighting. It works well with small, medium, large and very-very large files.
It has such settings as foreground color, font style, background color which can be adjusted for arbitrarily selected text symbols. One can easily gain access to a text with the use of regular expressions. WordWrap, Find/Replace, Code folding and multilevel Undo/Redo are supported as well.
More details http://www.codeproject.com/Articles/161871/Fast-Colored-TextBox-for-syntax-highlighting
Nuget package https://www.nuget.org/packages/FCTB/