}
  }

  public void testReplaceFrom() {
    assertThat(is('a').replaceFrom("yaha", 'o')).isEqualTo("yoho");
    assertThat(is('a').replaceFrom("yaha", "")).isEqualTo("yh");
    assertThat(is('a').replaceFrom("yaha", "o")).isEqualTo("yoho");
    assertThat(is('a').replaceFrom("yaha", "oo")).isEqualTo("yoohoo");
    assertThat(is('>').replaceFrom("12 > 5", ">")).isEqualTo("12 > 5");
  }

          "home.netscape.com",
          "pvt.k12.ca.us",
          "state.CA.us",
          "utenti.blah.IT",
          "web.MIT.edu",
          "www.google.com",
          "www.state.pa.us",
          "www4.yahoo.co.uk"
          // keep-sorted end
          );

  private static final ImmutableSet<String> NON_RS =
      ImmutableSet.<String>builder().addAll(NON_PS).addAll(PS_NOT_RS).build();

          "home.netscape.com",
          "pvt.k12.ca.us",
          "state.CA.us",
          "utenti.blah.IT",
          "web.MIT.edu",
          "www.google.com",
          "www.state.pa.us",
          "www4.yahoo.co.uk"
          // keep-sorted end
          );

  private static final ImmutableSet<String> NON_RS =
      ImmutableSet.<String>builder().addAll(NON_PS).addAll(PS_NOT_RS).build();