This is a very minor bug, but I still think it is important to point it out (maybe it was already).
I voted another question to be closed as duplicate of PHP preg_replace the backslash \PHP preg_replace the backslash \
Since the title ends with a backslash, the text generated is:

which results in

Though, linking to the question in this question (by just inserting the link) obviously creates an appropriate link. Maybe this automatic link detection / title creation should be done for comments as well, to avoid this issue (which I admit is a minor case)?
(Unfortunately it does not look like escaping the backslash (\\) helps in any way).
Other problematic characters:
Unescaped
]inside the title.
As @Konrad points out, it's a problem with Markdown not fully supported in comments. Escaping the slash works well here: php preg_replace \php preg_replace \.Trailing white spaces. This questionThis question has a trailing space in the title, shouldn't those be stripped out?
Again, this is a limitation of comment Markdown, it works fine here: Link with trailing space .