RFR: 206: Add proper escaping for replacement pattern

[Erik Helin]

On Mon, 16 Dec 2019 12:45:45 GMT, Robin Westberg <rwestberg at openjdk.org> wrote:

> Hi all,
> 
> Please review this fix that adds proper escaping for replacement patterns in the `TextToMarkdown.escapeFormatting` function. Previously it was possible for exceptions to be thrown on certain input containing regex control characters.
> 
> Best regards,
> Robin

Looks good!

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Marked as reviewed by ehelin (Reviewer).

PR: https://git.openjdk.java.net/skara/pull/333