diff --git a/src/parser.ts b/src/parser.ts
index 8abfab4af..302f2aa89 100644
--- a/src/parser.ts
+++ b/src/parser.ts
@@ -443,7 +443,14 @@ function validateInput (ctx: any) {
 
     const regex = inputsSpecification.spec.inputs[interpolationKey]?.regex;
     if (regex) {
-        ctx.writeStreams?.stderr(chalk`{black.bgYellowBright  WARN } spec:inputs:regex is currently not supported via gitlab-ci-local. This will just be a no-op.\n`);
+        let re: RegExp;
+        try {
+            re = new RegExp(regex);
+        } catch {
+            assert(false, chalk`This GitLab CI configuration is invalid: \`{blueBright ${configFilePath}}\`: \`{blueBright ${interpolationKey}}\` input: regex \`{blueBright ${regex}}\` is not a valid regular expression.`);
+        }
+        assert(re.test(String(inputValue)),
+            chalk`This GitLab CI configuration is invalid: \`{blueBright ${configFilePath}}\`: \`{blueBright ${interpolationKey}}\` input: \`{blueBright ${inputValue}}\` does not match required regex: {blueBright ${regex}}.`);
     }
 }
 
diff --git a/tests/test-cases/include-inputs/input-templates/regex-validation-invalid-pattern/.gitlab-ci-input-template.yml b/tests/test-cases/include-inputs/input-templates/regex-validation-invalid-pattern/.gitlab-ci-input-template.yml
new file mode 100644
index 000000000..20d1cd156
--- /dev/null
+++ b/tests/test-cases/include-inputs/input-templates/regex-validation-invalid-pattern/.gitlab-ci-input-template.yml
@@ -0,0 +1,9 @@
+---
+spec:
+  inputs:
+    version:
+      regex: ^[unclosed
+---
+deploy:
+  script:
+    - echo $[[ inputs.version ]]
diff --git a/tests/test-cases/include-inputs/input-templates/regex-validation-invalid-pattern/.gitlab-ci.yml b/tests/test-cases/include-inputs/input-templates/regex-validation-invalid-pattern/.gitlab-ci.yml
new file mode 100644
index 000000000..74492808e
--- /dev/null
+++ b/tests/test-cases/include-inputs/input-templates/regex-validation-invalid-pattern/.gitlab-ci.yml
@@ -0,0 +1,7 @@
+---
+include:
+  - local: '/.gitlab-ci-input-template.yml'
+    inputs:
+      version: "v1.2.3"
+stages:
+  - test
diff --git a/tests/test-cases/include-inputs/input-templates/regex-validation-pass/.gitlab-ci-input-template.yml b/tests/test-cases/include-inputs/input-templates/regex-validation-pass/.gitlab-ci-input-template.yml
new file mode 100644
index 000000000..668afe097
--- /dev/null
+++ b/tests/test-cases/include-inputs/input-templates/regex-validation-pass/.gitlab-ci-input-template.yml
@@ -0,0 +1,9 @@
+---
+spec:
+  inputs:
+    version:
+      regex: ^v\d+\.\d+\.\d+$
+---
+deploy:
+  script:
+    - echo $[[ inputs.version ]]
diff --git a/tests/test-cases/include-inputs/input-templates/regex-validation-pass/.gitlab-ci.yml b/tests/test-cases/include-inputs/input-templates/regex-validation-pass/.gitlab-ci.yml
new file mode 100644
index 000000000..74492808e
--- /dev/null
+++ b/tests/test-cases/include-inputs/input-templates/regex-validation-pass/.gitlab-ci.yml
@@ -0,0 +1,7 @@
+---
+include:
+  - local: '/.gitlab-ci-input-template.yml'
+    inputs:
+      version: "v1.2.3"
+stages:
+  - test
diff --git a/tests/test-cases/include-inputs/input-templates/regex-validation/.gitlab-ci-input-template.yml b/tests/test-cases/include-inputs/input-templates/regex-validation/.gitlab-ci-input-template.yml
new file mode 100644
index 000000000..668afe097
--- /dev/null
+++ b/tests/test-cases/include-inputs/input-templates/regex-validation/.gitlab-ci-input-template.yml
@@ -0,0 +1,9 @@
+---
+spec:
+  inputs:
+    version:
+      regex: ^v\d+\.\d+\.\d+$
+---
+deploy:
+  script:
+    - echo $[[ inputs.version ]]
diff --git a/tests/test-cases/include-inputs/input-templates/regex-validation/.gitlab-ci.yml b/tests/test-cases/include-inputs/input-templates/regex-validation/.gitlab-ci.yml
new file mode 100644
index 000000000..d513876a0
--- /dev/null
+++ b/tests/test-cases/include-inputs/input-templates/regex-validation/.gitlab-ci.yml
@@ -0,0 +1,7 @@
+---
+include:
+  - local: '/.gitlab-ci-input-template.yml'
+    inputs:
+      version: "invalid-version"
+stages:
+  - test
diff --git a/tests/test-cases/include-inputs/integration.test.ts b/tests/test-cases/include-inputs/integration.test.ts
index eabd4d6e2..79bb8f5bf 100644
--- a/tests/test-cases/include-inputs/integration.test.ts
+++ b/tests/test-cases/include-inputs/integration.test.ts
@@ -358,3 +358,60 @@ scan-website:
 
     expect(writeStreams.stdoutLines[0]).toEqual(expected);
 });
+
+test.concurrent("include-inputs regex validation (invalid)", async () => {
+    try {
+        const writeStreams = new WriteStreamsMock();
+        await handler({
+            cwd: "tests/test-cases/include-inputs/input-templates/regex-validation",
+            preview: true,
+        }, writeStreams);
+    } catch (e: any) {
+        assert(e instanceof AssertionError, "e is not instanceof AssertionError");
+        expect(e.message).toContain("This GitLab CI configuration is invalid:");
+        expect(e.message).toContain(
+            chalk`\`{blueBright version}\` input: \`{blueBright invalid-version}\` does not match required regex: {blueBright ^v\\d+\\.\\d+\\.\\d+$}.`,
+        );
+        return;
+    }
+
+    throw new Error("Error is expected but not thrown/caught");
+});
+
+test.concurrent("include-inputs regex validation (valid)", async () => {
+    const writeStreams = new WriteStreamsMock();
+    await handler({
+        cwd: "tests/test-cases/include-inputs/input-templates/regex-validation-pass",
+        preview: true,
+    }, writeStreams);
+
+    const expected = `---
+stages:
+  - .pre
+  - test
+  - .post
+deploy:
+  script:
+    - echo v1.2.3`;
+
+    expect(writeStreams.stdoutLines[0]).toEqual(expected);
+});
+
+test.concurrent("include-inputs regex validation (invalid pattern)", async () => {
+    try {
+        const writeStreams = new WriteStreamsMock();
+        await handler({
+            cwd: "tests/test-cases/include-inputs/input-templates/regex-validation-invalid-pattern",
+            preview: true,
+        }, writeStreams);
+    } catch (e: any) {
+        assert(e instanceof AssertionError, "e is not instanceof AssertionError");
+        expect(e.message).toContain("This GitLab CI configuration is invalid:");
+        expect(e.message).toContain(
+            chalk`\`{blueBright version}\` input: regex \`{blueBright ^[unclosed}\` is not a valid regular expression.`,
+        );
+        return;
+    }
+
+    throw new Error("Error is expected but not thrown/caught");
+});