WIP test: Too eager parsing of italic markup

[munen]

Related issue: #668

Here's the problem visualized:

However, why are the safe-guards not working? There should be one of \s({'" at the start of the match. But.. there isn't.

[schoettl]

Group 10 and 14 are optional. So they cannot prevent the matching starting and ending at inside a word.

And because of greedy group 13 .* it also parses /Foo/ Bar Baz/ as one italic sentence (but that is issue #175 ).