> The internals of the app uses NSRegularExpression I tried to implement my version of this idea[1] with regular expressions too, using OgreKit. I ran into all

> The internals of the app uses NSRegularExpression I tried to implement my version of this idea[1] with regular expressions too, using OgreKit. I ran into all sorts of problems with corner cases, especially with nesting of block-level elements (lists/blockquotes/code). I wanted to switch over to a parser-based implementation, but at the time all the existing parsers were setup to emit HTML, so getting character-offsets out of the parser wasn't possible without hacking the parser to death. There's been some good discussion on the Markdown list[2] recently about these sorts of things, a really interesting example is PEG Markdown Highlight[3], which is exactly what I wanted to do with my app, but I was too busy (read: lazy) to get around to. [1]: http://keshiki.net/markdown-editor/ http://keshiki.net/markdown-editor/ [2]: http://six.pairlist.net/mailman/listinfo/markdown-discuss http://six.pairlist.net/mailman/listinfo/markdown-discuss [3]: Project: http://hasseg.org/peg-markdown-highlight/ http://hasseg.org/peg-markdown-highlight/ Discussion: http://six.pairlist.net/pipermail/markdown-discuss/2011-June/002129.html http://six.pairlist.net/pipermail/markdown-discuss/2011-June...