package main
import (
"regexp"
"fmt"
)
func main() {
var re = regexp.MustCompile(`(?i)href=["']https?:\/\/(?<hostname>[^\/"]+)[^>]+>(?:https?:\/\/)?(?!.*\k'hostname')`)
var str = `<A HREF="http://phishers.org/we_want_your_money.htm">http://someLegitimateSite.com/somewhere </A>
<a href="https://example.com/subfolder">example.com</a>
<a href="http://somebadsite.com">https://somegoodsite.com</a>
`
for i, match := range re.FindAllString(str, -1) {
fmt.Println(match, "found at index", i)
}
}
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for Golang, please visit: https://golang.org/pkg/regexp/