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We use a markup style system in a CMS. It works in a similar way to the system used for asking questions on stackoverflow (though it uses a different syntax).

I am curious if the text editing system used by stackoverflow (that I am typing into now) is a commercially available plug-in or if it was developed by the team.

What I really want to figure out how to do is add buttons for bold etc that manipulate the text inside the textarea, but I am having trouble tracking down suitable information. The URL button seems the most complicated, as it will renumber all the references throughout your text if needed...

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up vote 11 down vote accepted

You can download the editor here. And read up on the process here.

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That is exactly what I was looking for. I can spend the rest of the day looking though the code... :-) – Rik Heywood Nov 26 '09 at 14:34

You can look at all tools used to build SO right here. As you can see, the editor WMD for Markdown is open source.

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