驼峰转下划线 golang

package main

import (

    "fmt"

    "regexp"

    "strings"

)

var matchNonAlphaNumeric = regexp.MustCompile(`[^a-zA-Z0-9]+`)

var matchFirstCap = regexp.MustCompile("(.)([A-Z][a-z]+)")

var matchAllCap = regexp.MustCompile("([a-z0-9])([A-Z])")

func ToSnakeCase(str string) string {

    str = matchNonAlphaNumeric.ReplaceAllString(str, "_")     //非常规字符转化为 _

    snake := matchFirstCap.ReplaceAllString(str, "${1}_${2}") //拆分出连续大写

    snake = matchAllCap.ReplaceAllString(snake, "${1}_${2}")  //拆分单词

    return strings.ToLower(snake)                             //全部转小写

}

func main() {

    fmt.Println(ToSnakeCase("IamXXX"))

}