package main
import (
"regexp"
"fmt"
)
func main() {
var re = regexp.MustCompile(`(?m)\.\w+-\w+(?=\h)`)
var str = `.carousel-fade .carousel-item-next.carousel-item-left, .carousel-fade .carousel-item-prev.carousel-item-right, .carousel-fade .carousel-item.active {
opacity: 1
}`
var substitution = "#elements $0"
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/