return "CharMatcher.is('" + showCharacter(match) + "')";
    }
  }

  /** Implementation of {@link #isNot(char)}. */
  private static final class IsNot extends FastMatcher {

    private final char match;

    IsNot(char match) {
      this.match = match;
    }

    @Override
    public boolean matches(char c) {
      return c != match;
    }

    @Override

  /** Matcher for type, subtype and attributes. */
  private static final CharMatcher TOKEN_MATCHER =
      ascii()
          .and(javaIsoControl().negate())
          .and(CharMatcher.isNot(' '))
          .and(CharMatcher.noneOf("()<>@,;:\\\"/[]?="));

  private static final CharMatcher QUOTED_TEXT_MATCHER = ascii().and(CharMatcher.noneOf("\"\\\r"));

  /*

  public void testToString() {
    assertToStringWorks("CharMatcher.none()", CharMatcher.anyOf(""));
    assertToStringWorks("CharMatcher.is('\\u0031')", CharMatcher.anyOf("1"));
    assertToStringWorks("CharMatcher.isNot('\\u0031')", CharMatcher.isNot('1'));
    assertToStringWorks("CharMatcher.anyOf(\"\\u0031\\u0032\")", CharMatcher.anyOf("12"));
    assertToStringWorks("CharMatcher.anyOf(\"\\u0031\\u0032\\u0033\")", CharMatcher.anyOf("321"));

  public void testToString() {
    assertToStringWorks("CharMatcher.none()", CharMatcher.anyOf(""));
    assertToStringWorks("CharMatcher.is('\\u0031')", CharMatcher.anyOf("1"));
    assertToStringWorks("CharMatcher.isNot('\\u0031')", CharMatcher.isNot('1'));
    assertToStringWorks("CharMatcher.anyOf(\"\\u0031\\u0032\")", CharMatcher.anyOf("12"));
    assertToStringWorks("CharMatcher.anyOf(\"\\u0031\\u0032\\u0033\")", CharMatcher.anyOf("321"));

      return "CharMatcher.is('" + showCharacter(match) + "')";
    }
  }

  /** Implementation of {@link #isNot(char)}. */
  private static final class IsNot extends FastMatcher {

    private final char match;

    IsNot(char match) {
      this.match = match;
    }

    @Override
    public boolean matches(char c) {
      return c != match;
    }

    @Override

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