package main
import (
"regexp"
"fmt"
)
func main() {
var re = regexp.MustCompile(`(?m)((?<ID>[2-9]{1}[0-9]{3}\s?[0-9]{4}\s?[0-9]{4}\s?)(?&ID){20,})`)
var str = `2453 1234 4367 2453 1234 4367 2453 1234 4367 2453 1234 4367 2453 1234 4367 2453 1234 4367 2453 1234 4367 2453 1234 4367 2453 1234 4367 2453 1234 4367 2453 1234 4367 2453 1234 4367 2453 1234 4367 2453 1234 4367 2453 1234 4367 2453 1234 4367 2453 1234 4367 2453 1234 4367 2453 1234 4367 2453 1234 4367 2453 1234 4367 `
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/