code: public static boolean isCertificateOperationIdentifier(String identifier) {
          identifier = verifyNonEmpty(identifier, "identifier");
  
          URI baseUri;
          try {
              baseUri = new URI(identifier);
          } catch (URISyntaxException e) {
              return false;
          }
  
          // Path is of the form "/certificates/[name]/pending"
          String[] segments = baseUri.getPath().split("/");
          if (segments.length != 4) {
              return false;
          }
  
          if (!(segments[1]).equals("certificates")) {
              return false;
          }
  
          if (!(segments[3]).equals("pending")) {
              return false;
          }
  
          return true;
      }
docs: Verifies whether the identifier belongs to a key vault certificate operation.
  @param identifier the key vault certificate operation identifier.
  @return true if the identifier belongs to a key vault certificate operation. False otherwise.