Regular expression for Japanese, English hashtag like Twitter

Question

Currently, I\'m using this regular expression to detect Japanese hashtag and English hashtag.

\\B([#＃][·・ー_0-9０-９a-zA-Zａ-ｚＡ-Ｚぁ-んァ-ン一-龠]{1,24})(?=\\W|$)