public static boolean isDecCharacter(final char c) {
    return CharMatcher.inRange('0', '9').apply(c);
  }
Tests whether a given character is a valid decimal character.

@param c The character to test.
@return True, if the given character is a valid decimal character.
java/zylib/src/main/java/com/google/security/zynamics/zylib/general/Convert.java