2 Added live example.
source | link

This works OK so long as you don't try to do it "raw":

http://en.wikipedia.org/wiki/A*_search_algorithm

won't work, whereas

[link][1]

  [1]: http://en.wikipedia.org/wiki/A*_search_algorithm

or

[link](http://en.wikipedia.org/wiki/A*_search_algorithm)

will: link, link.

This works OK so long as you don't try to do it "raw":

http://en.wikipedia.org/wiki/A*_search_algorithm

won't work, whereas

[link][1]

  [1]: http://en.wikipedia.org/wiki/A*_search_algorithm

or

[link](http://en.wikipedia.org/wiki/A*_search_algorithm)

will.

This works OK so long as you don't try to do it "raw":

http://en.wikipedia.org/wiki/A*_search_algorithm

won't work, whereas

[link][1]

  [1]: http://en.wikipedia.org/wiki/A*_search_algorithm

or

[link](http://en.wikipedia.org/wiki/A*_search_algorithm)

will: link, link.

1
source | link

This works OK so long as you don't try to do it "raw":

http://en.wikipedia.org/wiki/A*_search_algorithm

won't work, whereas

[link][1]

  [1]: http://en.wikipedia.org/wiki/A*_search_algorithm

or

[link](http://en.wikipedia.org/wiki/A*_search_algorithm)

will.