fix(examples): allow string created by regex pattern (#7829)

Co-authored-by: Tim Lai <timothy.lai@gmail.com>

Author: dewijones92

package.json

@@ -74,6 +74,7 @@
     "js-yaml": "=4.1.0",
     "lodash": "^4.17.21",
     "prop-types": "^15.8.1",
+    "randexp": "^0.5.3",
     "randombytes": "^2.1.0",
     "react": "=17.0.2",
     "react-copy-to-clipboard": "5.0.4",

src/core/plugins/samples/fn.js

@@ -1,11 +1,17 @@
 import XML from "xml"
+import RandExp from "randexp"
 import isEmpty from "lodash/isEmpty"
 import { objectify, isFunc, normalizeArray, deeplyStripKey } from "core/utils"
 
 import memoizeN from "../../../helpers/memoizeN"
 
+const generateStringFromRegex = (pattern) => {
+      const randexp = new RandExp(pattern)
+      return randexp.gen()
+}
+
 const primitives = {
-  "string": () => "string",
+  "string": (schema) => schema.pattern ? generateStringFromRegex(schema.pattern) : "string",
   "string_email": () => "user@example.com",
   "string_date-time": () => new Date().toISOString(),
   "string_date": () => new Date().toISOString().substring(0, 10),

test/unit/core/plugins/samples/fn.js

@@ -153,6 +153,23 @@ describe("sampleFromSchema", () => {
     expect(sampleFromSchema(definition, { includeReadOnly: true })).toEqual(expected)
   })
 
+
+
+  it("regex pattern test", function () {
+    let definition = {
+      type: "object",
+      properties: {
+        macAddress: {
+          type: "string",
+          pattern: "^([0-9A-Fa-f]{2}[:-]){5}([0-9A-Fa-f]{2})$"
+        }
+      }
+    }
+    const resp = sampleFromSchema(definition)
+
+    expect(new RegExp("^([0-9A-Fa-f]{2}[:-]){5}([0-9A-Fa-f]{2})$", "g").test(resp.macAddress)).toBe(true)
+  })
+
   it("returns object without deprecated fields for parameter", function () {
     let definition = {
       type: "object",