I know there is strings.Index and strings.LastIndex, but they just find the first and last. Is there any function I can use, where I can specify the start index? Something like the last line in my example.
Example:
s := "go gopher, go"
fmt.Println(strings.Index(s, "go")) // Position 0
fmt.Println(strings.LastIndex(s, "go")) // Postion 11
fmt.Println(strings.Index(s, "go", 1)) // Position 3 - Start looking for "go" begining at index 1
It's an annoying oversight, you have to create your own function.
Something like:
func indexAt(s, sep string, n int) int {
idx := strings.Index(s[n:], sep)
if idx > -1 {
idx += n
}
return idx
}
No, but it might be simpler to apply strings.Index on a slice of the string
strings.Index(s[1:], "go")+1
strings.Index(s[n:], "go")+n
See example (for the case where the string isn't found, see OneOfOne's answer), but, as commented by Dewy Broto, one can simply test it with a 'if' statement including a simple statement:
(also called 'if' with an initialization statement)
if i := strings.Index(s[n:], sep) + n; i >= n {
...
}
