Potentially two things:
Does the comment tag really include a colon at the end of the tag name?
Get rid of the space in front of " visit http" in your test.
Assuming the trailing colon is correct, you might try something like:
Note that this is just off the top of my head and hasn’t been tested, so it may need a bit of tweaking (e.g.: case sensitive). Please let us know if this helps address your issue, and if not, what it seems to be doing (or not doing) wrong.