package main
import (
"regexp"
"fmt"
)
func main() {
var re = regexp.MustCompile(`(?m)(?=^(?:\+|00)?(?:[\-\/\(\)]?\d){11}$)(?:00|\+)[^\d]*([\d])[^\d]*([\d])[^\d]*([\d])[^\d]*([\d])[^\d]*([\d])[^\d]*([\d])[^\d]*([\d])[^\d]*([\d])[^\d]*([\d])[^\d]*([\d])[^\d]*([\d])$`)
var str = `+48301234567
+4-8-3-0-1-2-3-4-5-6-7
+48/30/1234567
+48-30-12-345-67
+483011223344556677
0048301234567
+(48)30/1234567`
var substitution = "+(\1\2) \3\4/\5\6-\7\8\9-\10\11"
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/