从string.Replace（）Golang反向返回

Question

I have a large dataset where I needed to do some string manipulation (I know strings are immutable). The Replace() function in the strings package does exactly what I need, except I need it to search in reverse.

Say I have this string: AA-BB-CC-DD-EE

Run this script:

package main

import (
"fmt"
"strings"
)

func main() {
    fmt.Println(strings.Replace("AA-BB-CC-DD-EE", "-", "", 1))
}

It outputs: AABB-CC-DD-EE

What I need is: AA-BBCCDDEE, where the first instance of the search key is found, and the rest discarded.

Splitting the string, inserting the dash, and joining it back together works. But, I'm thinking there is a more performant way to achieve this.

Answer 1

String slices!

in := "AA-BB-CC-DD-EE"
afterDash := strings.Index(in, "-") + 1
fmt.Println(in[:afterDash] + strings.Replace(in[afterDash:], "-", "", -1))

(might require some tweaking to get the behavior you want in the case that the input has no dashes).