go的版本是1.4的

package main

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

var path *string = flag.String("p","./","搜索的路径")
var re_string *string = flag.String("r","","关键字")

func main() {
	flag.Parse()
	if *re_string == "" {
		fmt.Println("搜索的关键字不能为空")
		return
	}
	fmt.Println("搜索的路径：",*path,"搜索的关键字：",*re_string)
	re,_ := regexp.Compile(*re_string)
	filepath.Walk(*path,func(path string,info os.FileInfo,err error) error {
		if err != nil {
			return err
		}
		if info.IsDir() {
			return nil
		}
		fmt.Println("文件路径：",path)
		File,_ := os.Open(path)
		r := bufio.NewReader(File)
		for {
			b,_,e := r.ReadLine()
			if e != nil {
				break
			}
			if b,_ := regexp.Match(string([]byte{0}),b); b {
				break
			}
			if re.Match(b) {
				fmt.Println(string(b))
			}
		}
		File.Close()
		return nil
	})
}