diff --git a/cypress/integration/origin-save.spec.js b/cypress/integration/origin-save.spec.js
--- a/cypress/integration/origin-save.spec.js
+++ b/cypress/integration/origin-save.spec.js
@@ -1,5 +1,5 @@
 /**
- * Copyright (C) 2019  The Software Heritage developers
+ * Copyright (C) 2019-2020  The Software Heritage developers
  * See the AUTHORS file at the top-level directory of this distribution
  * License: GNU Affero General Public License version 3, or any later version
  * See top-level LICENSE file for more information
@@ -88,6 +88,19 @@
     });
   });
 
+  it('should validate gitlab subproject url', function() {
+    const gitlabSubProjectUrl = 'https://gitlab.com/user/project/sub/';
+    const originSaveUrl = this.Urls.origin_save_request('git', gitlabSubProjectUrl);
+    stubSaveRequest(originSaveUrl, 'git', 'accepted',
+                    gitlabSubProjectUrl, 'not yet scheduled');
+
+    makeOriginSaveRequest('git', gitlabSubProjectUrl);
+
+    cy.wait('@saveRequest').then(() => {
+      checkAlertVisible('success', saveCodeMsg['success']);
+    });
+  });
+
   it('should display warning message when pending', function() {
     stubSaveRequest(this.originSaveUrl, origin.type, 'pending',
                     origin.url, 'not created');
diff --git a/swh/web/assets/src/utils/functions.js b/swh/web/assets/src/utils/functions.js
--- a/swh/web/assets/src/utils/functions.js
+++ b/swh/web/assets/src/utils/functions.js
@@ -1,5 +1,5 @@
 /**
- * Copyright (C) 2018-2019  The Software Heritage developers
+ * Copyright (C) 2018-2020  The Software Heritage developers
  * See the AUTHORS file at the top-level directory of this distribution
  * License: GNU Affero General Public License version 3, or any later version
  * See top-level LICENSE file for more information
@@ -39,7 +39,7 @@
 
 export function isGitRepoUrl(url, domain) {
   let endOfPattern = '\\/[\\w\\.-]+\\/?(?!=.git)(?:\\.git(?:\\/?|\\#[\\w\\.\\-_]+)?)?$';
-  let pattern = `(?:git|https?|git@)(?:\\:\\/\\/)?${domain}[/|:][A-Za-z0-9-]+?` + endOfPattern;
+  let pattern = `(?:git|https?|git@)(?:\\:\\/\\/)?${domain}[/|:][A-Za-z0-9-/]+?` + endOfPattern;
   let re = new RegExp(pattern);
   return re.test(url);
 };