feat: Add regex option u for unicode support in Parse.Query.matches for MongoDB (#9867)

spec/ParseQuery.spec.js

@@ -2113,6 +2113,16 @@ describe('Parse.Query testing', () => {
       .then(done);
   });
 
+  it_id('351f57a8-e00a-4da2-887d-6e25c9e359fc')(it)('regex with unicode option', async function () {
+    const thing = new TestObject();
+    thing.set('myString', 'hello 世界');
+    await Parse.Object.saveAll([thing]);
+    const query = new Parse.Query(TestObject);
+    query.matches('myString', '世界', 'u');
+    const results = await query.find();
+    equal(results.length, 1);
+  });
+
   it_id('823852f6-1de5-45ba-a2b9-ed952fcc6012')(it)('Use a regex that requires all modifiers', function (done) {
     const thing = new TestObject();
     thing.set('myString', 'PArSe\nCom');

src/Controllers/DatabaseController.js

@@ -111,7 +111,7 @@ const validateQuery = (
   Object.keys(query).forEach(key => {
     if (query && query[key] && query[key].$regex) {
       if (typeof query[key].$options === 'string') {
-        if (!query[key].$options.match(/^[imxs]+$/)) {
+        if (!query[key].$options.match(/^[imxsu]+$/)) {
           throw new Parse.Error(
             Parse.Error.INVALID_QUERY,
             `Bad $options value for query: ${query[key].$options}`