diff --git a/core/src/tools/validation-util.ts b/core/src/tools/validation-util.ts
index 1ad3e62f77..01a1862d4f 100644
--- a/core/src/tools/validation-util.ts
+++ b/core/src/tools/validation-util.ts
@@ -34,7 +34,7 @@ export function validateUnsignedFloat(value: string): boolean {
 export function validateUrl(url: string): boolean {
 
     const urlRegex =
-        /^https?:\/\/(www\.)?[-a-zA-Z0-9@:%._\+~#=]{1,256}\.[a-zA-Z0-9()]{1,6}\b([-a-zA-Z0-9()@:%_\+.~#?&//=]*)$/;
+        /^https?:\/\/(localhost|(www\.)?[-a-zA-Z0-9@:%._\+~#=]{1,256}\.[a-zA-Z0-9()]{1,6})([-a-zA-Z0-9()@:%_\+.~#?&//=]*)$/;
 
     const result = url.match(urlRegex);
     return result !== null && result[0] === url;
diff --git a/core/test/tools/validation-util.spec.ts b/core/test/tools/validation-util.spec.ts
index e9f23e45e6..daf37c2d32 100644
--- a/core/test/tools/validation-util.spec.ts
+++ b/core/test/tools/validation-util.spec.ts
@@ -71,6 +71,9 @@ describe('ValidationUril', () => {
         
         expect(validateUrl('http://www.example.de')).toBe(true);
         expect(validateUrl('https://www.example.de')).toBe(true);
+        expect(validateUrl('http://localhost:4000')).toBe(true);
+        expect(validateUrl('http://example.de')).toBe(true);
+        expect(validateUrl('http://abc')).toBe(false);
         expect(validateUrl('www.example.de')).toBe(false);
         expect(validateUrl('abc')).toBe(false);
     });