package main
import (
"regexp"
"fmt"
)
func main() {
var re = regexp.MustCompile(`(?m)\b([a-z]{1}[0-9]{4}|[a-z]{2}[0-9]{3}|[a-z]{3}[0-9]{2}|[a-z]{4}[0-9]{1})\b`)
var str = `Positive matches: a1111, aa111, aaa11, aaaa1
Negative matches: a1a1a, aa11a, aa11, 1aaaa `
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/