* replaced by a given replacement sequence. For example:
   *
   * {@snippet :
   * CharMatcher.is('a').replaceFrom("yaha", "oo")
   * }
   *
   * ... returns {@code "yoohoo"}.
   *
   * <p><b>Note:</b> If the replacement is a fixed string with only one character, you are better
   * off calling {@link #replaceFrom(CharSequence, char)} directly.
   *