golang 字符串替换 使用strings.replacer 替换为 strings.replace 

strings.replace的使用方式

package main

import (
	"fmt"
	"strings"
)

func main() {
	str := "aaa bbb ddd fff aaa"
	keyword := "aaa"
	str = strings.ReplaceAll(str, keyword, "**")

	fmt.Println(str)
}

strings.replacer的使用方式

package main

import (
	"fmt"
	"strings"
)

func main() {
	str := "aaa bbb ddd fff aaa"
	keyword := "aaa"
	replacer := strings.NewReplacer(keyword, "**")
	str = replacer.Replace(str)

	fmt.Println(str)
}

为什么要替换

“we see that Replace creates more runtime memory allocations than New Replacer.”

参考：

https://medium.com/@vikram.ingawale91/golang-strings-replace-vs-strings-replacer-a7b2d2b71593

https://levelup.gitconnected.com/multi-string-replace-in-golang-with-replacer-148d4173f439