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
@@ -132,6 +132,22 @@
     });
   });
 
+  it('should validate project url with _ in username', function() {
+    const gitlabSubProjectUrl = 'https://gitlab.com/user_name/project.git';
+    const originSaveUrl = this.Urls.origin_save_request('git', gitlabSubProjectUrl);
+
+    stubSaveRequest({requestUrl: originSaveUrl,
+                     saveRequestStatus: 'accepted',
+                     originurl: gitlabSubProjectUrl,
+                     saveTaskStatus: 'not yet scheduled'});
+
+    makeOriginSaveRequest('git', gitlabSubProjectUrl);
+
+    cy.wait('@saveRequest').then(() => {
+      checkAlertVisible('success', saveCodeMsg['success']);
+    });
+  });
+
   it('should display warning message when pending', function() {
     stubSaveRequest({requestUrl: this.originSaveUrl,
                      saveRequestStatus: 'pending',
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
@@ -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}[/|:][\\w\\.\\-\\/]+?` + endOfPattern;
   let re = new RegExp(pattern);
   return re.test(url);
 };