small go program to replace aws credentials

rey.go

package main

import (
	"fmt"
	"io/ioutil"
	"os"
	"regexp"
)

func main() {
	awsId := regexp.MustCompile("(A3T[A-Z0-9]|AKIA|AGPA|AIDA|AROA|AIPA|ANPA|ANVA|ASIA)[A-Z0-9]{16}")
	awsSecret := regexp.MustCompile("[A-Za-z0-9/\\+=]{40}")
	awsAccountId := regexp.MustCompile("[0-9]{4}\\-?[0-9]{4}\\-?[0-9]{4}")
	privateKey := regexp.MustCompile(`(?s)-{3,}([\s\S]*?)-{3,}\n([\s\S\n].*)\n-{3,}([\s\S]*?)-{3,}`)

	in,_ := ioutil.ReadAll(os.Stdin)

	text := string(in)
	text = awsId.ReplaceAllString(text, "< aws id >")
	text = awsSecret.ReplaceAllString(text, "< aws secret >")
	text = awsAccountId.ReplaceAllString(text, "< aws account id >")
	text = privateKey.ReplaceAllString(text, "-----\n< private key >\n-----")

	fmt.Println(text)
}