Japanese character matcher for Java8

japanese_matcher.java

  private static final Pattern PAT_JAPANESE_CHARACTER = Pattern
      .compile("[\\p{IsHiragana}\\p{IsKatakana}\\p{InCJKUnifiedIdeographs}]");

  private static boolean isJapanese(final String token) {
    return PAT_JAPANESE_CHARACTER.matcher(token).find();
  }