You can refer below regex to allow item names in Chinese as well as Japanese characters.
^[一^[\u4E00-龠]+|[ぁ\u9FFF]|[\u3040-ゔ]+|[ァ\u30FF\u31F0-ヴー]+|[々〆〤ヶ]+\/u|[\w\*\$][\w\s\\u31FF\uFF00-\uFFEF]|[\w\*\$][\w\s\-\$]*(\(\d{1,}\)){0,1}$
This will allow items to be created as below.
Note: This regex will also allow English characters in addition to alphanumeric characters in Japanese and Chinese.
Hope this helps!!!