Go Lang find files with extension from the current working directory.

findFilesWithExtension.go

/* Go Lang find files with extension from the current working directory.
Copyright (c) 2010-2014 Alex Niderberg */

package main

import (
	"fmt"
	"os"
	"path/filepath"
	"regexp"
)

func main() {
	fmt.Println(checkExt(".txt"))
}

func checkExt(ext string) []string {
	pathS, err := os.Getwd()
	if err != nil {
		panic(err)
	}
	var files []string
	filepath.Walk(pathS, func(path string, f os.FileInfo, _ error) error {
		if !f.IsDir() {
			r, err := regexp.MatchString(ext, f.Name())
			if err == nil && r {
				files = append(files, f.Name())
			}
		}
		return nil
	})
	return files
}

Nice thanks!

You can also write regex in the ext variable.
if you have a file with .txt.bak, you can just add a $ to the end. This means that the extension .txt must always be at the end and nothing more may come after it.

func main() {
	fmt.Println(checkExt(".txt$"))
}

Or for a more advanced selection:

# Files in Folder
my_nice.txt
my_second-nice.txt
my_nice.txt.bak
superduper.txt

func main() {
	fmt.Println(checkExt("my_.*.txt$"))
}

Output: [my_nice.txt my_second-nice]