diff --git a/dlp/inspectWithCustomRegex.js b/dlp/inspectWithCustomRegex.js
new file mode 100644
index 0000000000..216e883432
--- /dev/null
+++ b/dlp/inspectWithCustomRegex.js
@@ -0,0 +1,95 @@
+// Copyright 2023 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+'use strict';
+
+// sample-metadata:
+//  title: Inspects strings
+//  description: Inspects a string using custom regex pattern.
+//  usage: node inspectWithCustomRegex.js my-project string customRegex
+
+function main(projectId, string, customRegex) {
+  // [START dlp_inspect_custom_regex]
+  // Imports the Google Cloud Data Loss Prevention library
+  const DLP = require('@google-cloud/dlp');
+
+  // Instantiates a client
+  const dlp = new DLP.DlpServiceClient();
+
+  // The project ID to run the API call under
+  // const projectId = 'my-project';
+
+  // The string to inspect
+  // const string = 'Patients MRN 444-5-22222';
+
+  // The regex pattern to match for
+  // const customRegex = '[1-9]{3}-[1-9]{1}-[1-9]{5}';
+
+  async function inspectWithCustomRegex() {
+    // Construct item to inspect
+    const item = {
+      byteItem: {
+        type: DLP.protos.google.privacy.dlp.v2.ByteContentItem.BytesType
+          .TEXT_UTF8,
+        data: Buffer.from(string, 'utf-8'),
+      },
+    };
+
+    // Construct the custom regex detector.
+    const customInfoTypes = [
+      {
+        infoType: {
+          name: 'C_MRN',
+        },
+        likelihood: DLP.protos.google.privacy.dlp.v2.Likelihood.POSSIBLE,
+        regex: {
+          pattern: customRegex,
+        },
+      },
+    ];
+
+    // Construct request
+    const request = {
+      parent: `projects/${projectId}/locations/global`,
+      inspectConfig: {
+        customInfoTypes: customInfoTypes,
+        includeQuote: true,
+      },
+      item: item,
+    };
+
+    // Run request
+    const [response] = await dlp.inspectContent(request);
+    const findings = response.result.findings;
+    if (findings.length > 0) {
+      console.log('Findings: \n');
+      findings.forEach(finding => {
+        console.log(`InfoType: ${finding.infoType.name}`);
+        console.log(`\tQuote: ${finding.quote}`);
+        console.log(`\tLikelihood: ${finding.likelihood} \n`);
+      });
+    } else {
+      console.log('No findings.');
+    }
+  }
+  inspectWithCustomRegex();
+  // [END dlp_inspect_custom_regex]
+}
+
+process.on('unhandledRejection', err => {
+  console.error(err.message);
+  process.exitCode = 1;
+});
+
+main(...process.argv.slice(2));
diff --git a/dlp/system-test/inspect.test.js b/dlp/system-test/inspect.test.js
index 94b68030f1..43fde3e7f8 100644
--- a/dlp/system-test/inspect.test.js
+++ b/dlp/system-test/inspect.test.js
@@ -309,4 +309,38 @@ describe('inspect', () => {
     assert.notMatch(outputB, /EMAIL_ADDRESS/);
     assert.match(outputB, /PHONE_NUMBER/);
   });
+
+  // dlp_inspect_custom_regex
+  it('should inspect a string using custom regex', () => {
+    const string = 'Patients MRN 444-5-22222';
+    const custRegex = '[1-9]{3}-[1-9]{1}-[1-9]{5}';
+    const output = execSync(
+      `node inspectWithCustomRegex.js ${projectId} "${string}" "${custRegex}"`
+    );
+    assert.match(output, /InfoType: C_MRN/);
+    assert.match(output, /Likelihood: POSSIBLE/);
+  });
+
+  it('should handle string with no match', () => {
+    const string = 'Patients MRN 444-5-22222';
+    const custRegex = '[1-9]{3}-[1-9]{2}-[1-9]{5}';
+    const output = execSync(
+      `node inspectWithCustomRegex.js ${projectId} "${string}" "${custRegex}"`
+    );
+    assert.include(output, 'No findings');
+  });
+
+  it('should report any errors while inspecting a string', () => {
+    let output;
+    const string = 'Patients MRN 444-5-22222';
+    const custRegex = '[1-9]{3}-[1-9]{2}-[1-9]{5}';
+    try {
+      output = execSync(
+        `node inspectWithCustomRegex.js BAD_PROJECT_ID "${string}" "${custRegex}"`
+      );
+    } catch (err) {
+      output = err.message;
+    }
+    assert.include(output, 'INVALID_ARGUMENT');
+  });
 });