package main
import (
"regexp"
"fmt"
)
func main() {
var re = regexp.MustCompile(`(?m)^(?:ISBN(?:-13)?:? )?(?<gs1>\d{3})(?:(?<number>\d{9})|(?=[\d -]{14}$)[ -](?<registrationGroup>\d{1,5})[ -](?<registrant>\d{1,7})[ -](?<publication>\d{1,6})[ -])(?<checkDigit>\d)$`)
var str = `9781861978769
97818619787659
978186197879
978-1-86197-876-9
978-1-86197-87-9
978-1-86197-8765-9
978-186197-876-9
978-186197-8-76-9`
for i, match := range re.FindAllString(str, -1) {
fmt.Println(match, "found at index", i)
}
}
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/