/guava/android/guava/src/com/google/common/net/InternetDomainName.java
return true;
return false;
String asciiChars = CharMatcher.ascii().retainFrom(part); if (!PART_CHAR_MATCHER.matchesAllOf(asciiChars)) { return false; } if (DASH_MATCHER.matches(part.charAt(0)) || DASH_MATCHER.matches(part.charAt(part.length() - 1))) { <extra_id_0> } if (isFinalPart && DIGIT_MATCHER.matches(part.charAt(0))) { return false; } return true; }