Valid links: [this is a link]() [this is a link]() [this is a link](http://something.example.com/foo/bar 'test') ![this is an image]() ![this is an image]() ![this is an image](http://something.example.com/foo/bar 'test') [escape test](<\>\>\>\>\>\>\>\>\>\>\>\>\>\>> '\'\'\'\'\'\'\'\'\'\'\'\'\'\'') [escape test \]\]\]\]\]\]\]\]\]\]\]\]\]\]\]\]](\)\)\)\)\)\)\)\)\)\)\)\)\)\)) Invalid links: [this is not a link [this is not a link]( [this is not a link](http://something.example.com/foo/bar 'test' [this is not a link]((((((((((((((((((((((((((((((((((((((((((((((( [this is not a link]((((((((((()))))))))) (((((((((()))))))))))