๏ปฟ IDN
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internationalized domain name (IDN)

multi-byte Unicode
    public UnicodeSet getNumberRepresentatives(String identifier) {
        int cp;
        UnicodeSet numerics = new UnicodeSet();
        for (int i = 0; i < identifier.length(); i += Character.charCount(i)) {
            cp = Character.codePointAt(identifier, i);
            // Store a representative character for each kind of decimal digit
            switch (UCharacter.getType(cp)) {
            case UCharacterCategory.DECIMAL_DIGIT_NUMBER:
                // Just store the zero character as a representative for comparison. 
                // Unicode guarantees it is cp - value.
                numerics.add(cp - UCharacter.getNumericValue(cp));
                break;
            case UCharacterCategory.OTHER_NUMBER:
            case UCharacterCategory.LETTER_NUMBER:
                throw new IllegalArgumentException("Should not be in identifiers.");
            }
        } 
        return numerics;
    }
...
    UnicodeSet numerics = getMixedNumbers(String identifier);
    if (numerics.size() > 1) reject(identifer, numerics);
    
    
    



IDN DNS Name Language Code HTML Glyph
แ….net xn--1ce.net Canadian Syllabics O U+1405 &#5125; แ…
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๊ˆธ.net xn--417a.net Yi Syllable Mguop U+A238 &#41528; ๊ˆธ
เฝ€.com xn--5cd.com Tibetan Letter Ka U+0F40 &#3904; เฝ€
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๊†น.com xn--iy7a.com Yi Syllable Li U+A1B9 &#41401; ๊†น
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๊ž.com xn--jb8a.com Yi Syllable Zhyp U+A35E &#41822; ๊ž
๊ฟ.com xn--jp7a.com Yi Syllable Nba U+A07F &#41087; ๊ฟ
แ’ฃ.com xn--khe.com Canadian Syllabics Me U+14A3 &#5283; แ’ฃ
แ .com xn--m6e.com Mongolian Digit Zero U+1810 &#6160; แ 
แ’ฅ.com xn--mhe.com Canadian Syllabics Mi U+14A5 &#5285; แ’ฅ
แ–ฝ.com xn--mpe.com Canadian Syllabics Blackfoot Ki U+15BD &#5565; แ–ฝ
แ’ง.com xn--ohe.com Canadian Syllabics Mo U+14A7 &#5287; แ’ง
๊.com xn--re8a.com Yi Syllable Ro U+A3CF &#41935; ๊
๊ฒ.com xn--rf8a.com Yi Syllable Ju U+A3F2 &#41970; ๊ฒ
แŸ.com xn--sde.com Canadian Syllabics Final Acute U+141F &#5151; แŸ
เฎช.net xn--xlc.net Tamil Letter Pa U+0BAA &#2986; เฎช
๊‡ญ.com xn--zz7a.com Yi Syllable Gop U+A1ED &#41453; ๊‡ญ