package main
import (
"regexp"
"fmt"
)
func main() {
var re = regexp.MustCompile(`(?m)(?<=\A|\})(\s*)\{`)
var str = []byte(`a
{
color:black;
background-color:blue;
}
{color:red}
<!-- TEST -->
@media screen and (max-width:620px) {
/* TEST 2 */
a.test {color:blue;}
p[class="test2"] {color:green;}
}`)
var substitution = []byte("$1.missing-selector {")
var count = 1 // negative counter is equivalent to global case (replace all)
str = re.ReplaceAllStringFunc(str, func(s string) string {
if count == 0 {
return s
}
count -= 1
return re.ReplaceAllString(s, substitution)
})
fmt.Println(string(str))
}
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/