package main
import (
"regexp"
"fmt"
)
func main() {
var re = regexp.MustCompile(`(?m)<h1>(.*?)<\/h1>((?!<h1>))*`)
var str = `<h1>Foo</h1><h2>Bar</h2><h1>Baz</h1><h3>Test</h3><h1>ghj</h1>zuio`
var substitution = "$1 $2"
fmt.Println(re.ReplaceAllString(str, substitution))
}
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/