package main
import (
"regexp"
"fmt"
)
func main() {
var re = regexp.MustCompile(`(?m)^[a-zA-Z](?!.*(['-]).*\1)(?!.* )(?=.{0,19}$)[a-zA-Z0-9'-]*(?: (?<=[a-zA-Z] )[a-zA-Z][a-zA-Z0-9'-]*)*$`)
var str = `This is aa
This is aa test
aa aa aa aa aa aa aa
This should m'atch
This a-lso'
This is a test
a b
aa
a
This is aa test
This' is aa tes
This is aaaa longer test
This sh'o'uld not
This sh-o-uld not
`
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/