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');