src/main/java/org/apache/commons/validator/routines/DomainValidator.java [2215:2226]:
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        if (domain == null) {
            return false;
        }
        domain = unicodeToASCII(domain);
        // hosts must be equally reachable via punycode and Unicode
        // Unicode is never shorter than punycode, so check punycode
        // if domain did not convert, then it will be caught by ASCII
        // checks in the regexes below
        if (domain.length() > MAX_DOMAIN_LENGTH) {
            return false;
        }
        final String[] groups = domainRegex.match(domain);
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src/main/java/org/apache/commons/validator/routines/DomainValidator.java [2248:2259]:
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        if (domain == null) {
            return false;
        }
        domain = unicodeToASCII(domain);
        // hosts must be equally reachable via punycode and Unicode
        // Unicode is never shorter than punycode, so check punycode
        // if domain did not convert, then it will be caught by ASCII
        // checks in the regexes below
        if (domain.length() > MAX_DOMAIN_LENGTH) {
            return false;
        }
        final String[] groups = domainRegex.match(domain);
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