linkify

input := `
	Check out this link to http://google.com
You can also email support@example.com to view more.

Some more links: fsf.org http://www.gnu.org/licenses/gpl-3.0.en.html 127.0.0.1
                 localhost:80	github.com/trending?l=Go	//reddit.com/r/golang
mailto:r@golang.org some.nonexistent.host.name flibustahezeous3.onion
`
for _, l := range Links(input) {
	fmt.Printf("Scheme: %-8s  URL: %s\n", l.Scheme, input[l.Start:l.End])
}

Output:

Scheme: http:     URL: http://google.com
Scheme: mailto:   URL: support@example.com
Scheme:           URL: fsf.org
Scheme: http:     URL: http://www.gnu.org/licenses/gpl-3.0.en.html
Scheme:           URL: 127.0.0.1
Scheme:           URL: localhost:80
Scheme:           URL: github.com/trending?l=Go
Scheme: //        URL: //reddit.com/r/golang
Scheme: mailto:   URL: mailto:r@golang.org
Scheme:           URL: some.nonexistent.host.name
Scheme:           URL: flibustahezeous3.onion