package main
import (
"regexp"
"fmt"
)
func main() {
var re = regexp.MustCompile(`\A(?=\D*\d)(?=[^A-Z]*[A-Z][^A-Z]*\z)[A-Za-z\d]{4}\z`)
var str = `e3Wd`
if len(re.FindStringIndex(str)) > 0 {
fmt.Println(re.FindString(str),"found at index",re.FindStringIndex(str)[0])
}
}
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/