package main
import (
"regexp"
"fmt"
)
func main() {
var re = regexp.MustCompile(`(?m)(?<!\S)@?([^\s@]+)@[^\s@]+(?!\S)`)
var str = `firstname.lastname@domain.co.uk
firstname.middlename.lastname@domain.co.uk
@firstname.lastname@domain.co.uk
The cat sat on the mat whilst @firstname.lastname@domain.co.uk watched in silence.
The cat sat on the mat whilst @firstname.@lastname@domain.co.uk watched in silence.`
var substitution = "$1"
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/