Regular Expression for Japanese characters

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Here is a regular expression that can be used to match all English alphanumeric characters, Japanese katakana, hiragana, multibytes of alphanumerics (hankaku and zenkaku), and dashes:

/[一-龠]+|[ぁ-ゔ]+|[ァ-ヴー]+|[a-zA-Z0-9]+|[ａ-ｚＡ-Ｚ０-９]+|[々〆〤ヶ]+/u

You can edit it to fit your needs, but notice the “u” flag at the end.

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