Regex for multiple languages (en/th/jp)

slugify.js

/**
 * Make slug from string.
 * Support: en, th, ja
 * @see https://gist.github.com/mathewbyrne/1280286
 * @see http://so-zou.jp/software/tech/programming/tech/regular-expression/meta-character/variable-width-encoding.htm
 * @see https://python3.wannaphong.com/2015/12/regular-expression-ภาษาไทย-และภาษาอื่น-python.html
 * @return {String} Slug
 */
const whitespace_like_regex = /[\s_]+/g;
// en: a-z, A-Z, 0-9, -
// th: Ko Kai - Sara Uu, Sara Ee - Thanthakhat, Thai Zero - Thai Nine
//     (Excludes Phintu, Thai Baht, Nikhahit, Yamakkan, Fongman, Angkhankhu, Khomut)
// ja: Kanji, Hiragana, Katakana
const nonword_regex = /[^a-z0-9\-ก-\u0E39เ-\u0E4C๐-๙亜-熙ぁ-んァ-ヶ]+/g;
module.export = function slugify(str) {
  return str.toString().toLowerCase()
    .replace(whitespace_like_regex, '-') // Replace spaces with -
    .replace(nonword_regex, '')          // Remove all non-word chars
    .replace(/\-\-+/g, '-')             // Replace multiple - with single -
    .replace(/^-+/, '')                  // Trim - from start of text
    .replace(/-+$/, '');
};