package main
import (
"regexp"
"fmt"
)
func main() {
var re = regexp.MustCompile(`(?m)(?P<username>[a-zA-Z0-9.-_]+)@(?P<domain>[a-zA-Z0-9.-_]+)\.(?P<ltd>[a-zA-Z0-9-_]+)`)
var str = `The mail or post is a system for physically transporting postcards, letters, and parcels.[1] A postal service can be private or public, though many governments place restrictions on private systems. Since the mid-19th century,yvannak54@gmail.com national postal systems have generally been established as a government monopoly, with a fee on the article prepaid. Proof of payment is usually in the form of an adhesive postage stamp, but a it123@gmail.com postage meter is also used for bulk mailing. Modern private postal systems are distinguished from national postal agencies by the terms "courier" or "delivery service".
`
var substitution = "<a href="mailto:\0">${username}</a>"
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/