The string can be treated as a slice

package main

import "strings"

func main() {
    s := "This is a string"
    n := strings.Index(s[5:], "is")
}

Thanks

n2 := strings.Index(s[n1:], "is")
so n1+n2 will be the position index of substr in the original string, right

yes. I forgot to mention that the slice is sort of a new string so indexing begins at 0 again

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