diff --git a/products/cloudbuild/api.yaml b/products/cloudbuild/api.yaml
index 0a96068cfba3..ecd96549f0bd 100644
--- a/products/cloudbuild/api.yaml
+++ b/products/cloudbuild/api.yaml
@@ -133,6 +133,11 @@ objects:
               This must be a relative path. If a step's dir is specified and
               is an absolute path, this value is ignored for that step's
               execution.
+
+          - !ruby/object:Api::Type::Boolean
+            name: 'invertRegex'
+            description: |
+              Only trigger a build if the revision regex does NOT match the revision regex.
           - !ruby/object:Api::Type::String
             name: 'branchName'
             description: |
@@ -198,6 +203,10 @@ objects:
                 values:
                   - :COMMENTS_DISABLED
                   - :COMMENTS_ENABLED
+              - !ruby/object:Api::Type::Boolean
+                name: 'invertRegex'
+                description: |
+                    If true, branches that do NOT match the git_ref will trigger a build.
           - !ruby/object:Api::Type::NestedObject
             name: 'push'
             description: |
@@ -206,6 +215,10 @@ objects:
               - github.0.pull_request
               - github.0.push
             properties:
+              - !ruby/object:Api::Type::Boolean
+                name: 'invertRegex'
+                description: |
+                    When true, only trigger a build if the revision regex does NOT match the git_ref regex.
               - !ruby/object:Api::Type::String
                 name: 'branch'
                 description: |
diff --git a/third_party/terraform/tests/resource_cloudbuild_trigger_test.go b/third_party/terraform/tests/resource_cloudbuild_trigger_test.go
index d3c4e7ccdfa3..e00c347f4a62 100644
--- a/third_party/terraform/tests/resource_cloudbuild_trigger_test.go
+++ b/third_party/terraform/tests/resource_cloudbuild_trigger_test.go
@@ -194,6 +194,7 @@ resource "google_cloudbuild_trigger" "build_trigger" {
   trigger_template {
     branch_name = "master"
     repo_name   = "some-repo"
+	invert_regex = false
   }
   build {
     images = ["gcr.io/$PROJECT_ID/$REPO_NAME:$COMMIT_SHA"]
@@ -221,6 +222,7 @@ resource "google_cloudbuild_trigger" "build_trigger" {
   trigger_template {
     branch_name = "master-updated"
     repo_name   = "some-repo-updated"
+	invert_regex = true
   }
   build {
     images = ["gcr.io/$PROJECT_ID/$REPO_NAME:$SHORT_SHA"]