package main
import (
"regexp"
"fmt"
)
func main() {
var re = regexp.MustCompile(`(?m)(?<=.)[^@\n](?=[^@\n]*?@)|(?:(?<=@.)|(?!^)\G(?=[^@\n]*$)).(?=.*[^@\n]\.)`)
var str = `john.doe@example.en.com
foo@bar.com
foo-and.more!here@bar.com
fo@bar.com
f@bar.com`
var substitution = "*"
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/