single attribute support?

I’m trying to use shortcodes to support the following so I can post urls that same way I do to popular forum sites:

[url=http://www.blah.com]Follow My Link![/url]
or
[url=”http://www.blah.com”%5DFollow My Link![/url]

I’ve tried:
{{content}}

and I’ve tried:
{{content}}

and neither work. Is this supported any other way?

https://wordpress.org/plugins/my-shortcodes/