feat(regex): add new kafka username regex (#2782)

Co-authored-by: mjolly <mjolly@scaleway.com>

Author: MathildeJolly

.changeset/calm-singers-whisper.md

@@ -0,0 +1,5 @@
+---
+"@scaleway/regex": minor
+---
+
+feat(regex): add new kafka username regex

packages/regex/src/__tests__/index.test.ts

@@ -38,6 +38,7 @@ import {
   ipv4Cidr,
   ipv6,
   ipv6Cidr,
+  kafkaUsernameRegex,
   macAddress,
   nineDigitsCode,
   organizationAlias,
@@ -1153,6 +1154,19 @@ describe('@regex', () => {
     })
   })
 
+  describe('kafkaUsernameRegex', () => {
+    test.each([
+      ['username', true],
+      ['user-name', true],
+      ['my-group.user-name', true],
+      ['-user-name', false],
+      ['user-Name-', false],
+      ['user..name', false],
+    ])('should match regex %s to be %s', (string, expected) => {
+      expect(kafkaUsernameRegex.test(string)).toBe(expected)
+    })
+  })
+
   describe('uuid', () => {
     test.each([
       [asciiLetters, false],

packages/regex/src/index.ts

@@ -98,3 +98,7 @@ export const sgPortRange =
 
 // Include all characters except backtick ` and @ as first character
 export const password = /^(?!@)[^`]*$/
+
+// A kafka username contains lowercase letters and numbers, with each segment starting and ending with a letter or number. Hyphens are only allowed in the middle of segments. Example: "username", "user-name", "my-group.user-name"
+export const kafkaUsernameRegex =
+  /^[a-z0-9]([-a-z0-9]*[a-z0-9])?(\.[a-z0-9]([-a-z0-9]*[a-z0-9])?)*$/