Regular Expression Set for MarkDown

Good afternoon, dear users of Habr.
In this post I would like to share with what was played for a long time and I hope it will be useful to someone.

Recently I faced the fact that in the new project it was necessary to make syntax highlighting for MarkDown markup language. Recently, it is quite popular in different places. Googled for a long time, as a result, I had to write everything myself and for a long time to test everything to work correctly.
Under the cut are a set of regular expressions that are looking for the basic markdown markup elements in the variant for Objective-c.


H1

^# (.)+$ //   ^.+$\n^={3,}$ //     

H2

 ^#{2,2} (.)+$ //   ^.+$\n^-{3,}$ //     

H3 ... H6

 ^#{3,3} (.)+$ ... ^#{6,6} (.)+$ 

bold (** Text **)

 (?<!\*|\\\*)\*{2,2}[^\*\n].+?[^\*]\*{2,2}(?!\*|\\) 

italic (* Text * or _text_)

 ((?<!\*|\\)\*[^\*\n].+?[^\*|\\]\*(?!\*))|(_.+?_) 

bold italic (*** Text ***)

 (?<!\*|\\)\*{3,3}[^\*\n].+?[^\*|\\]\*{3,3}(?!\*) 

monospace (`text`)

 `[^`]*` 

Numbered list

 (^\d{1,3}\. .*$)+|(^ {1,10}\d{1,3}\. .*$)+ 

Unnumbered list

 (^(\*|\+|-) .*$)+ 

image! [img alt] (http: //image.url/img.png)

 !\[[^\[\]]*?\]\(.*?\) 

url [link] (http://site.com/)

 \[[^\[\]]*?\]\(.*?\)|^\[*?\]\(.*?\) 

block quotes

 ^>{1,4} (.)+$ 

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Here is a piece of the screenshot from the application in which these regular expressions were applied.