Add support for regex format

Author: jdesrosiers

formats/formats-test-suite.spec.ts

@@ -25,11 +25,6 @@ type Test = {
 };
 
 const skip = new Set<string>([
-  // Not supported
-  "|draft2020-12|ecmascript-regex.json",
-  "|draft2019-09|ecmascript-regex.json",
-  "|draft7|ecmascript-regex.json",
-
   // Not supported
   "|draft2020-12|email.json",
   "|draft2019-09|email.json",
@@ -60,11 +55,6 @@ const skip = new Set<string>([
   "|draft7|json-pointer.json",
   "|draft6|json-pointer.json",
 
-  // Not supported
-  "|draft2020-12|regex.json",
-  "|draft2019-09|regex.json",
-  "|draft7|regex.json",
-
   // Not supported
   "|draft2020-12|relative-json-pointer.json",
   "|draft2019-09|relative-json-pointer.json",

formats/handlers/regex.js

@@ -0,0 +1,16 @@
+export default {
+  id: "https://json-schema.org/format/regex",
+  handler: (regex) => {
+    if (typeof regex !== "string") {
+      return true;
+    }
+
+    try {
+      new RegExp(regex, "u");
+    } catch (_error) {
+      return false;
+    }
+
+    return true;
+  }
+};

formats/index.js

@@ -12,6 +12,7 @@ import iri from "./handlers/iri.js";
 import iriReference from "./handlers/iri-reference.js";
 import uuid from "./handlers/uuid.js";
 import uriTemplate from "./handlers/uri-template.js";
+import regex from "./handlers/regex.js";
 
 
 addFormat(dateTime);
@@ -26,6 +27,7 @@ addFormat(iri);
 addFormat(iriReference);
 addFormat(uuid);
 addFormat(uriTemplate);
+addFormat(regex);
 
 export {
   getShouldValidateFormat,