How can I know the position of a substring in a string, in characteres (or runes) instead of bytes?
strings.Index(s, sub) will give the position in bytes. When using Unicode, it doesn't match the position in runes: http://play.golang.org/p/DnlFjPaD2j
func main() {
s := "áéíóúÁÉÍÓÚ"
fmt.Println(strings.Index(s, "ÍÓ"))
}
Result: 14. Expected: 7
Of course, I could convert s and sub to []rune and look for the subslice manually, but is there a better way to do it?
Related to this, to get the first n characters of a string I'm doing this: string([]rune(s)[:n]). Is it the best way?
You can do it like this, after importing the unicode/utf8 package:
func main() {
s := "áéíóúÁÉÍÓÚ"
i := strings.Index(s, "ÍÓ")
fmt.Println(utf8.RuneCountInString(s[:i]))
}