Check in codegen test expectations.

test/codegen/expect/language/reg_ex2_test.js

Index: test/codegen/expect/language/reg_ex2_test.js
diff --git a/test/codegen/expect/language/reg_ex2_test.js b/test/codegen/expect/language/reg_ex2_test.js
new file mode 100644
index 0000000000000000000000000000000000000000..a8437c70ac0250640b3ad47f6b103ee55c10c701
--- /dev/null
+++ b/test/codegen/expect/language/reg_ex2_test.js
@@ -0,0 +1,37 @@
+dart_library.library('language/reg_ex2_test', null, /* Imports */[
+  'dart_sdk'
+], function load__reg_ex2_test(exports, dart_sdk) {
+  'use strict';
+  const core = dart_sdk.core;
+  const dart = dart_sdk.dart;
+  const dartx = dart_sdk.dartx;
+  const reg_ex2_test = Object.create(null);
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  reg_ex2_test.RegEx2Test = class RegEx2Test extends core.Object {
+    static testMain() {
+      let helloPattern = core.RegExp.new("with (hello)");
+      let s = "this is a string with hello somewhere";
+      let match = helloPattern.firstMatch(s);
+      if (match != null) {
+        core.print("got match");
+        let groupCount = match.groupCount;
+        core.print(dart.str`groupCount is ${groupCount}`);
+        core.print(dart.str`group 0 is ${match.group(0)}`);
+        core.print(dart.str`group 1 is ${match.group(1)}`);
+      } else {
+        core.print("match not round");
+      }
+      core.print("done");
+    }
+  };
+  dart.setSignature(reg_ex2_test.RegEx2Test, {
+    statics: () => ({testMain: dart.definiteFunctionType(dart.void, [])}),
+    names: ['testMain']
+  });
+  reg_ex2_test.main = function() {
+    reg_ex2_test.RegEx2Test.testMain();
+  };
+  dart.fn(reg_ex2_test.main, VoidTodynamic());
+  // Exports:
+  exports.reg_ex2_test = reg_ex2_test;
+});