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For example:
http://en.wikipedia.org/wiki/Conway's_Game_of_Life
Setting it up as a link through Markdown doesn't work either: This is a link once it's posted, but not in the editor. The link works both during edit and after posting w/o apostrophe in the same URL, but it's obviously wrong.
Because it can lead to some scripting exploits, we don't allow unencoded ' or " in URLs.
<http://en.wikipedia.org/wiki/Conway's_Game_of_Life>
Since Wikipedia supports workarounds for this and other problematic characters -- just omit them:
<http://en.wikipedia.org/wiki/Conways_Game_of_Life>
http://en.wikipedia.org/wiki/Conways_Game_of_Life
or properly encode it
http://meyerweb.com/eric/tools/dencoder/
Per the spec these chars are not allowed unencoded in URLs anyway
https://www.rfc-editor.org/rfc/rfc3986#section-2.2
reserved = gen-delims / sub-delims
gen-delims = ":" / "/" / "?" / "#" / "[" / "]" / "@"
sub-delims = "!" / "$" / "&" / "'" / "(" / ")"
/ "*" / "+" / "," / ";" / "="
Edit: This works fine now with Markdown links, i.e. using [bla](http://etc), the link button, Ctrl-L or similar.
", one about$, and one about)