package main
import (
"regexp"
"fmt"
)
func main() {
var re = regexp.MustCompile(`(?m)^(?:dog(?:, |$))*(?:cat)?$`)
var str = `cat
dog, cat
dog, dog, cat
dog, dog, dog
dog, dog, dog, cat
dog, dog, dog, dog, cat
dog, dog, dog, dog, dog
dog, dog, dog, dog, dog, cat
dog, dog, dog, dog, dog, dog, dog, cat
dog, dog, dog, dog, dog, dog, dog, dog, dog
`
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/