Shortcode: if last parameter ends with '/', it is mistaken for self-closing shortcode closure

[sergem]

In example:

[shortcode urlparam=​http://somesite/path/]content textshortcode

"[shortcode urlparam=​http://somesite/path/]"

is interpreted as self closing:

[shortcode/] with urlparam="​http://somesite/path"

All examples in ​http://codex.wordpress.org/Shortcode_API include whitespace before '/]'

This prevents implementation of bbcode parser for people to paste flickr photo snippets.