Is there a different syntax for commenting with links that contain parentheses? I tried something like this:
And that yielded this in the comment:
It's the same syntax, but rendering balanced matching parens is quite expensive in regex, and the comment regexes are run every time the post loads and displays -- so the support in comments isn't as good as in posts. We do however support one level of balanced parentheses, which covers your case.
As Jon noted, use
%29 to encode the parens in cases where they aren't balanced or are nested more than one level deep.