golang: normalize string (include Vietnamese)

normalize_string.go

package main

import (
	"fmt"
	"golang.org/x/text/runes"
	"golang.org/x/text/transform"
	"golang.org/x/text/unicode/norm"
	"strings"
	"unicode"
)

func main() {
	trans := transform.Chain(norm.NFD, runes.Remove(runes.In(unicode.Mn)), norm.NFC)
	result, _, _ := transform.String(trans, "Á|đ|Đ|Â|à|á|ạ|ả|ã|â|ầ|ấ|ậ|ẩ|ẫ|ă|ằ|ắ|ặ|ẳ|ẵ|è|é|ẹ|ẻ|ẽ|ê|ề|ế|ệ|ể|ễì|í|ị|ỉ|ĩ|ò|ó|ọ|ỏ|õ|ô|ồ|ố|ộ|ổ|ỗ|ơ|ờ|ớ|ợ|ở|ỡ|ù|ú|ụ|ủ|ũ|ư|ừ|ứ|ự|ử|ữ|ỳ|ý|ỵ|ỷ|ỹ")
	result = strings.ReplaceAll(result, "đ", "d")
	result = strings.ReplaceAll(result, "Đ", "D")
	fmt.Println(result)
	// Should print: A|d|D|A|a|a|a|a|a|a|a|a|a|a|a|a|a|a|a|a|a|e|e|e|e|e|e|e|e|e|e|ei|i|i|i|i|o|o|o|o|o|o|o|o|o|o|o|o|o|o|o|o|o|u|u|u|u|u|u|u|u|u|u|u|y|y|y|y|y
}