package main
import (
"regexp"
"fmt"
)
func main() {
var re = regexp.MustCompile(`(?m)(?:^(?!.*([._-])[._-]{1,})[A-Za-z0-9][A-Za-z0-9._-]{0,33}[A-Za-z0-9]$)|(?:^[A-Za-z0-9]{1,2}$)`)
var str = `OKs
A
AB
1
2022
ABC123
ABC-123
ABC-DE-123
ABC-DE.123
NOT_OK!
-
A-
-A
ABC--123
ABC.-123
`
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/