如何从字符串中删除最后4个字符？

Question

I want to remove the last 4 characters from a string, so "test.txt" becomes "test".

package main

import (
    "fmt"
    "strings"
)

func main() {
    file := "test.txt"
    fmt.Print(strings.TrimSuffix(file, "."))
}

Answer 1

You can use this to remove everything after last "."
go playground

package main

import (
    "fmt"
    "strings"
)

func main() {
    sampleInput := []string{
    "/www/main.js",
    "/tmp/test.txt",
    "/tmp/test2.text",
    "/tmp/test3.verylongext",
    "/user/bob.smith/has.many.dots.exe",
    "/tmp/zeroext.",
    "/tmp/noext",
    "",
    "tldr",
    }
    for _, str := range sampleInput {
        fmt.Println(removeExtn(str))
    }
}

func removeExtn(input string) string {
    if len(input) > 0 {
        if i := strings.LastIndex(input, "."); i > 0 {
            input = input[:i]
        }
    }
    return input
}