feat(regex): add new isJson regex

Author: Echo-IV

.changeset/green-mangos-shake.md

@@ -0,0 +1,5 @@
+---
+"@scaleway/regex": minor
+---
+
+regex: add new isJson regex

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

@@ -38,6 +38,7 @@ import {
   ipv4Cidr,
   ipv6,
   ipv6Cidr,
+  isJson,
   kafkaUsernameRegex,
   macAddress,
   nineDigitsCode,
@@ -1154,6 +1155,19 @@ describe('@regex', () => {
     })
   })
 
+  describe('isJson', () => {
+    test.each([
+      ['{"key": "value"}', true],
+      ['{"key": {"nested": "value"}}', true],
+      ['{"key": ["array", "value"]}', true],
+      ['{"key": "value"', false],
+      ['{"key": {"nested": "value"', false],
+      ['{"key": ["array", "value"', false],
+    ])('should match regex %s to be %s', (string, expected) => {
+      expect(isJson.test(string)).toBe(expected)
+    })
+  })
+
   describe('kafkaUsernameRegex', () => {
     test.each([
       ['username', true],

packages/regex/src/index.ts

@@ -102,3 +102,5 @@ export const password = /^(?!@)[^`]*$/
 // A kafka username contains lowercase letters and numbers, with each segment starting and ending with a letter or number. Hyphens are only allowed in the middle of segments. Example: "username", "user-name", "my-group.user-name"
 export const kafkaUsernameRegex =
   /^[a-z0-9]([-a-z0-9]*[a-z0-9])?(\.[a-z0-9]([-a-z0-9]*[a-z0-9])?)*$/
+
+export const isJson = /({(?:[^{}]|{(?:[^{}]|{[^{}]*})*})*})/s