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If you know the associated numeric values for the Japanese characters, the associated regular expression becomes relatively simple.

If you look at: http://www.rikai.com/library/kanjitables/kanji_codes.unicode.shtml you will see a table for all the Japanese character unicode values, so if you just want to check for the Hiragana/Katakana alphabets, your regex becomes

[\u3041 - \u309F]* | [\u30A0 - \u30FF]*

note: perl and pcre do not support \u, instead use \x{####}, also this regex will only identify whether some string has a regex already contained within it. It does not also check for Kanji characters

You may also find http://www.regular-expressions.info/unicode.html useful.

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