Fix url parse on markdown formatted urls

[jf-guillou]

#1857 allowed wider fragment matches, but breaks auto url embed with markdown urls. See #2034

This pr attemps to improve this behaviour.

Previously :

"[stream](https://www.twitch.tv/stream)".match(/([A-Za-z]{3,9}):\/\/([-;:&=\+\$,\w]+@{1})?([-A-Za-z0-9\.]+)+:?(\d+)?((\/[-\+=!:~%\/\.@\,\w]+)?\??([-\+=&!:;%@\/\.\,\w]+)?#?([^\s]+)?)?/)

https://www.twitch.tv/stream)

With this pr :

"[stream](https://www.twitch.tv/stream)".match(/([A-Za-z]{3,9}):\/\/([-;:&=\+\$,\w]+@{1})?([-A-Za-z0-9\.]+)+:?(\d+)?((\/[-\+=!:~%\/\.@\,\w]+)?\??([-\+=&!:;%@\/\.\,\w]+)?(?:#([^\s]+))?)?/)

https://www.twitch.tv/stream

Fragments still works :

"https://www.twitch.tv/stream#with/fragment".match(/([A-Za-z]{3,9}):\/\/([-;:&=\+\$,\w]+@{1})?([-A-Za-z0-9\.]+)+:?(\d+)?((\/[-\+=!:~%\/\.@\,\w]+)?\??([-\+=&!:;%@\/\.\,\w]+)?(?:#([^\s]+))?)?/)

https://www.twitch.tv/stream#with/fragment

But markdown format with fragments are still failing :

"[stream](https://www.twitch.tv/stream#with/fragment)".match(/([A-Za-z]{3,9}):\/\/([-;:&=\+\$,\w]+@{1})?([-A-Za-z0-9\.]+)+:?(\d+)?((\/[-\+=!:~%\/\.@\,\w]+)?\??([-\+=&!:;%@\/\.\,\w]+)?(?:#([^\s]+))?)?/)

https://www.twitch.tv/stream#with/fragment)

I cannot find a way to correctly handle this case since parenthesis are allowed in fragments

[rodrigok]

I think we can ignore the ) in fragments, so you can change (?:#([^\s]+))? to (?:#([^\s\)]+))?

[jf-guillou]

Got to admit that ) in fragments is rare enough to be ignored

[rodrigok]

LGTM

[engelgabriel]

LGTM