2

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.

2

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

http://tools.ietf.org/html/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.

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