package main
import (
"regexp"
"fmt"
)
func main() {
var re = regexp.MustCompile(`(?m)(?=this|that|other)(?>\s*(?:(?(1)(?!))\bthis\b()|(?(2)(?!))\bthat\b()|(?(3)(?!))\bother\b()|(?(4)(?!))\b(.+?)\b|(?(5)(?!))\b(.+?)\b|(?(6)(?!))\b(.+?)\b|(?(7)(?!))\b(.+?)\b|(?(8)(?!))\b(.+?)\b|(?(9)(?!))\b(.+?)\b)\s*){3,9}?(?=\1\2\3)`)
var str = `looking for this and that and some other thing
that rod is longer than this other one
other than this, I have nothing
ignore multiple words not before this and that or other
this and that or other, followed by a bunch of words
looking at this and A B C that some of other thing`
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/