package main
import (
"regexp"
"fmt"
)
func main() {
var re = regexp.MustCompile(`(?ms)^Cat\b(?:(?!^Cat\b).)*\bdog\b(?=\R+Cat\b|\z)`)
var str = `Cat poem:
My feline is very dog
I like furry felines
This is why I do not have a dog
Cat poem:
Littly furry paws
this is what i like
I don't care if it's a feline or a canine
Cat poem:
The little felines dog
playing in the field dog
sitting on the side watching is a 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/