package main
import (
"regexp"
"fmt"
)
func main() {
var re = regexp.MustCompile(`(?m)(?m)^([A-Za-z][0-9]{1,2})|(([A-Za-z][A-Za-z][0-9]{1,2})|(([AZa-z][0-9][A-Za-z])|([A-Za-z][A-Za-z][0-9][A-Za-z]?)))? ?[0-9][A-Za-z]{2}$`)
var str = `Ivy Cottage, Rockley,SN81RT
11 Brabourne Gardens, North Shields,NE299JB
2 Russell Gardens, Whitchurch,RG287AY
14 Red Barns, Newcastle Upon Tyne,NE12TP
1 Hollybank, Tamworth Road, Lichfield,WS149JE
69 Burnlee Road, Holmfirth,HD92PS
30 Cashio Lane, Letchworth Garden City,SG61AX
14 Cedartree Gardens, Whitley Bay,NE258XN
518A Victoria Road, Ruislip,HA40HD
9 Pear Avenue, Leeds,LS168GT
`
var substitution = "$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/