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

[sergem]

In example:

[shortcode urlparam=http://somesite/path/]content text[/shortcode]

"[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.

Similar to HTML, the [shortcode/] syntax is a self-closing shortcode, and there's no easy way to distinguish that from the argument value, unless you enclose that in quotes, which should work:

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

Suggesting to close as invalid.

lookbehind non-whitespace does it nicely!