diff --git a/src/request_id_header.ts b/src/request_id_header.ts
index d4259d0b3..34ca0ca21 100644
--- a/src/request_id_header.ts
+++ b/src/request_id_header.ts
@@ -88,8 +88,6 @@ function newAtomicCounter(n?: number): AtomicCounter {
   return new AtomicCounter(n);
 }
 
-const X_GOOG_REQ_ID_REGEX = /(\d+\.){5}\d+/;
-
 interface withHeaders {
   headers: {[k: string]: string};
 }
@@ -189,8 +187,11 @@ export interface RequestIDError extends grpc.ServiceError {
   requestID: string;
 }
 
+const X_GOOG_REQ_ID_REGEX = /^1\.[0-9A-Fa-f]{8}(\.\d+){3}\.\d+/;
+
 export {
   AtomicCounter,
+  X_GOOG_REQ_ID_REGEX,
   X_GOOG_SPANNER_REQUEST_ID_HEADER,
   craftRequestId,
   injectRequestIDIntoError,
diff --git a/test/gapic_spanner_v1.ts b/test/gapic_spanner_v1.ts
index 3b63c6909..3605e6c66 100644
--- a/test/gapic_spanner_v1.ts
+++ b/test/gapic_spanner_v1.ts
@@ -26,6 +26,10 @@ import * as spannerModule from '../src';
 import {PassThrough} from 'stream';
 
 import {protobuf} from 'google-gax';
+import {
+  X_GOOG_REQ_ID_REGEX,
+  X_GOOG_SPANNER_REQUEST_ID_HEADER,
+} from '../src/request_id_header';
 
 // Dynamically loaded proto JSON is needed to get the type information
 // to fill in default values for request objects
@@ -486,9 +490,9 @@ describe('v1.SpannerClient', () => {
       ).getCall(0).args[1].otherArgs.headers;
       const actualHeaderRequestParams = actualHeaders['x-goog-request-params'];
       assert(actualHeaderRequestParams.includes(expectedHeaderRequestParams));
-      // const actualRequestID = actualHeaders['x-goog-spanner-request-id'];
-      // console.log('headers', actualHeaders);
-      // assert.deepStrictEqual(actualRequestID, 'foo');
+      // const actualRequestID = actualHeaders[X_GOOG_SPANNER_REQUEST_ID_HEADER];
+      // console.log(`headers ${JSON.stringify(actualHeaders)}`);
+      // assert.deepStrictEqual(actualRequestID!.match(X_GOOG_REQ_ID_REGEX) !== null, true);
     });
 
     it('invokes batchCreateSessions without error using callback', async () => {
diff --git a/test/spanner.ts b/test/spanner.ts
index 0199f6cf6..dce92ade7 100644
--- a/test/spanner.ts
+++ b/test/spanner.ts
@@ -59,6 +59,8 @@ import {
 } from '../src/common';
 import {
   RequestIDError,
+  X_GOOG_REQ_ID_REGEX,
+  X_GOOG_SPANNER_REQUEST_ID_HEADER,
   randIdForProcess,
   resetNthClientId,
 } from '../src/request_id_header';
@@ -74,7 +76,6 @@ import Priority = google.spanner.v1.RequestOptions.Priority;
 import TypeCode = google.spanner.v1.TypeCode;
 import NullValue = google.protobuf.NullValue;
 import {SessionFactory} from '../src/session-factory';
-import {X_GOOG_SPANNER_REQUEST_ID_HEADER} from '../src/request_id_header';
 
 const {
   AlwaysOnSampler,
@@ -313,7 +314,6 @@ describe('Spanner with mock server', () => {
       servicePath: 'localhost',
       port,
       sslCreds: grpc.credentials.createInsecure(),
-      // interceptors: [xGoogReqIDInterceptor.generateLoggingClientInterceptor()],
     });
     // Gets a reference to a Cloud Spanner instance and database
     instance = spanner.instance('instance');
@@ -2748,7 +2748,7 @@ describe('Spanner with mock server', () => {
               `${grpc.status.NOT_FOUND} NOT_FOUND: ${fooNotFoundErr.message}`
             );
             assert.deepStrictEqual(
-              (e as RequestIDError).requestID.match(requestIDRegex) != null,
+              (e as RequestIDError).requestID.match(requestIDRegex) !== null,
               true
             );
           }
@@ -2796,7 +2796,7 @@ describe('Spanner with mock server', () => {
               `${grpc.status.NOT_FOUND} NOT_FOUND: ${fooNotFoundErr.message}`
             );
             assert.deepStrictEqual(
-              (e as RequestIDError).requestID.match(requestIDRegex) != null,
+              (e as RequestIDError).requestID.match(requestIDRegex) !== null,
               true
             );
           }
@@ -2877,7 +2877,6 @@ describe('Spanner with mock server', () => {
             (e as ServiceError).message,
             'No resources available.'
           );
-          // assert.deepStrictEqual((e as RequestIDError).requestID,`1.${randIdForProcess}.1.1.1.1`);
         }
       } finally {
         if (tx1) {
@@ -2952,7 +2951,6 @@ describe('Spanner with mock server', () => {
         assert.fail('missing expected error');
       } catch (err) {
         assert.strictEqual((err as ServiceError).code, Status.NOT_FOUND);
-        // assert.deepStrictEqual((err as RequestIDError).requestID,`1.${randIdForProcess}.1.1.1.1`);
       } finally {
         await database.close();
       }
@@ -3014,7 +3012,6 @@ describe('Spanner with mock server', () => {
           (err as ServiceError).code,
           Status.PERMISSION_DENIED
         );
-        // assert.deepStrictEqual((err as RequestIDError).requestID,`1.${randIdForProcess}.1.1.1.1`);
       } finally {
         await database.close();
       }
@@ -5440,5 +5437,3 @@ function getRowCountFromStreamingSql(
 function sleep(ms): Promise<void> {
   return new Promise(resolve => setTimeout(resolve, ms));
 }
-
-const X_GOOG_REQ_ID_REGEX = /^1\.[0-9A-Fa-f]{8}(\.\d+){3}\.\d+/;