code: public static Matcher<Result> anyString() {
          return new Matcher<Result>() {
              @Override
              public Result matches(String input, boolean isEof) {
                  return input.length() > 0 ? success(input, "", input) : failure(input, false);
              }
  
              @Override
              public String toString() {
                  return "anyString";
              }
          };
      }
docs: Creates a matcher that matches when at least one character exists in the input buffer.
  <p/>
  If the result is successful, the {@link net.sf.expectit.Result#getBefore()} returns an
  empty string, the
  {@link net.sf.expectit.Result#group()} returns the entire input buffer.
  
  @return the result