regex to validate names following k8s validation rule

Signed-off-by: matteobarone <barmat90@gmail.com>

.changeset/flat-donkeys-rhyme.md

@@ -0,0 +1,5 @@
+---
+'@backstage/catalog-model': minor
+---
+
+Changed the regex to validate names following the Kubernetes validation rule, this allow to be more permissive validating the name of the object in Backstage.

packages/catalog-model/src/validation/KubernetesValidatorFunctions.test.ts

@@ -76,9 +76,10 @@ describe('KubernetesValidatorFunctions', () => {
     ['a-b', true],
     ['-a-b', false],
     ['a-b-', false],
-    ['a--b', false],
+    ['a--b', true],
     ['a_b', true],
     ['a.b', true],
+    ['a..b', true],
   ])(`isValidObjectName %p ? %p`, (value, matches) => {
     expect(KubernetesValidatorFunctions.isValidObjectName(value)).toBe(matches);
   });
@@ -114,9 +115,10 @@ describe('KubernetesValidatorFunctions', () => {
     ['a-b', true],
     ['-a-b', false],
     ['a-b-', false],
-    ['a--b', false],
+    ['a--b', true],
     ['a_b', true],
     ['a.b', true],
+    ['a..b', true],
     ['a/a', true],
     ['a-b.c/a', true],
     ['a--b.c/a', false],
@@ -150,9 +152,10 @@ describe('KubernetesValidatorFunctions', () => {
     ['a-b', true],
     ['-a-b', false],
     ['a-b-', false],
-    ['a--b', false],
+    ['a--b', true],
     ['a_b', true],
     ['a.b', true],
+    ['a..b', true],
   ])(`isValidLabelValue %p ? %p`, (value, matches) => {
     expect(KubernetesValidatorFunctions.isValidLabelValue(value)).toBe(matches);
   });
@@ -169,9 +172,10 @@ describe('KubernetesValidatorFunctions', () => {
     ['a-b', true],
     ['-a-b', false],
     ['a-b-', false],
-    ['a--b', false],
+    ['a--b', true],
     ['a_b', true],
     ['a.b', true],
+    ['a..b', true],
     ['a/a', true],
     ['a-b.c/a', true],
     ['a--b.c/a', false],

packages/catalog-model/src/validation/KubernetesValidatorFunctions.ts

@@ -48,7 +48,7 @@ export class KubernetesValidatorFunctions {
       typeof value === 'string' &&
       value.length >= 1 &&
       value.length <= 63 &&
-      /^[a-z0-9A-Z]+([-_.][a-z0-9A-Z]+)*$/.test(value)
+      /^([A-Za-z0-9][-A-Za-z0-9_.]*)?[A-Za-z0-9]$/.test(value)
     );
   }