I ran into a problem when I was sharing in a forum a thumbnail picture with a link to the larger picture. The link had an apostrophe and the BBCODE used in forums will not read the link properly. The solution was to substitute the apostrophe with either %27 or ' like below.
Note make sure url is in small letters because it won’t work in all caps. Given changes above, you should now be able to share links with apostrophes in forums. Just in case you were curious the picture I was trying to share is seen below. It’s the baby of a colleague which he Photoshopped with Sharingan eyes. Cute isn’t it?