fix(NODE-3282): BSONRegExp options not alphabetized

src/regexp.ts

@@ -35,9 +35,7 @@ export class BSONRegExp {
     if (!(this instanceof BSONRegExp)) return new BSONRegExp(pattern, options);
 
     this.pattern = pattern;
-    this.options = options ?? '';
-    // Execute
-    alphabetize(this.options);
+    this.options = alphabetize(options ?? '');
 
     // Validate options
     for (let i = 0; i < this.options.length; i++) {

test/node/bson_corpus_tests.js

@@ -107,6 +107,11 @@ describe('BSON Corpus', function () {
 
               if (v.degenerate_bson) {
                 const dB = Buffer.from(v.degenerate_bson, 'hex');
+                // Degenerate BSON to JS equals canonical BSON in JS
+                expect(BSON.deserialize(cB, deserializeOptions)).to.deep.equal(
+                  BSON.deserialize(dB, deserializeOptions)
+                );
+                // Dengenerate BSON roundtripped is transformed to canonical BSON
                 expect(cB).to.deep.equal(
                   BSON.serialize(BSON.deserialize(dB, deserializeOptions), serializeOptions)
                 );

test/node/bson_test.js

@@ -2164,6 +2164,13 @@ describe('BSON', function () {
     done();
   });
 
+  describe('BSONRegExp', () => {
+    it('Should alphabetize options', () => {
+      const b = new BSONRegExp('cba', 'mix');
+      expect(b.options).to.equal('imx');
+    });
+  });
+
   /**
    * @ignore
    */