Remove accents for Vietnamese

remove-accents.go

package main

import (
	"fmt"
	"regexp"
	"unicode"

	"golang.org/x/text/runes"
	"golang.org/x/text/transform"
	"golang.org/x/text/unicode/norm"
)
// RemoveAccent function
func RemoveAccent(s string) string {
	s = strings.ReplaceAll(s, "Đ", "D") // Don't know why Đ|đ cannot be transformed to D|d so we need to use this 
	s = strings.ReplaceAll(s, "đ", "d")
	t := transform.Chain(norm.NFD, runes.Remove(runes.In(unicode.Mn)), norm.NFC)
	res, _, _ := transform.String(t, s)
	return res
}
func main() {
	fmt.Println(RemoveAccent(`à|á|ạ|ã|ả|ă|ắ|ằ|ẳ|ẵ|ặ|â|ấ|ầ|ẩ|ẫ|ậ
	è|ẻ|ẽ|é|ẹ|ê|ề|ể|ễ|ế|ệ
	ì|ỉ|ĩ|í|ị
	ù|ủ|ũ|ú|ụ|ư|ừ|ử|ữ|ứ|ự
	ỳ|ỷ|ỹ|ý|ỵ
	ò|ỏ|õ|ó|ọ|ô|ồ|ổ|ỗ|ố|ộ|ơ|ờ|ở|ỡ|ớ|ợ
	Đ|đ
	`))
}