package main
import (
"regexp"
"fmt"
)
func main() {
var re = regexp.MustCompile(`(?:src|action|href)=[\'"]\K/(?!/)[^\'"]*`)
var str = `<img src="/relative/url/img.jpg" />
<form action="/">
<form action="/contact-us/">
<a href='/relative/url/'>Note the Single Quote</a>
<img src="//site.com/protocol-relative-img.jpg" />
`
var substitution = "https://example.com$0"
fmt.Println(re.ReplaceAllString(str, substitution))
}
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/