@AfterTemplate
    CharMatcher after() {
      return CharMatcher.javaDigit();
    }
  }

  class JavaLetterOrDigit {
    @BeforeTemplate
    CharMatcher before() {
      return CharMatcher.JAVA_LETTER_OR_DIGIT;
    }

    @AfterTemplate
    CharMatcher after() {
      return CharMatcher.javaLetterOrDigit();
    }
  }

  class JavaUpperCase {
    @BeforeTemplate
    CharMatcher before() {