If you want to use code-point ranges, Unicode property classes (see perlunicode) are pretty handy. 

sub identify_CJK {
    local $_ = shift;

    return "J" if /\p{Hiragana}|\p{Katakana}/;
    return "K" if /\p{Hangul}/;
    return "C" if /\p{Han}/;
    return "Others";

    # Note that the order matters because Japanese text
    # most likely contains Hanzi (Kanji) characters and
    # so does Korean text (less frequently though).
}

[download]
I think it works in most cases as long as all the texts you want to test are converted to Perl's internal representation of strings (with utf8 flag on).

In reply to Re^2: How to Identify a language by Anonymous Monk
in thread How to Identify a language by moshkod

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