Is there a strings.LastIndex that counts runes instead of bytes?

Getting Help
1

Learning Go. Is there a strings.LastIndex that counts runes instead of bytes?

s1 := “test- 1” // using hyphen
fmt.Println(strings.LastIndex(s1, " ")) // outputs 5
s2 := “test— 2” // using long dash instead of hyphen
fmt.Println(strings.LastIndex(s2, " ")) // outputs 7

If I count runes, the space is at 5 in both and that’s what I want.

2

You’ll probably have to roll your own but it should be pretty simple. Range over the string- that will get you its runes, and then just keep track of the last index you’ve found a match at as you iterate.

3 Likes
3

That worked. Thanks.

4

If this is performance critical you can also look at this:

5

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