linkify . url http://www.youtube.com/watch?v=5Jt5GEr4AYg. .
url http://www.youtube.com/watch?v=5Jt5GEr4AYg.
. don't touch text in links . [https://example.com](https://example.com) . . don't touch text in autolinks .www.example.org版权所有
. emails . test@example.com mailto:test@example.com . .