Check in codegen test expectations.

test/codegen/expect/corelib/regexp/issue_19193_test.js

+dart_library.library('corelib/regexp/issue_19193_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__issue_19193_test(exports, dart_sdk, expect) {
+  'use strict';
+  const core = dart_sdk.core;
+  const dart = dart_sdk.dart;
+  const dartx = dart_sdk.dartx;
+  const expect$ = expect.expect;
+  const issue_19193_test = Object.create(null);
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  issue_19193_test.main = function() {
+    let re = core.RegExp.new('.*(a+)+\\d');
+    expect$.Expect.isTrue("a0aaaaaaaaaaaaa"[dartx.contains](re));
+    expect$.Expect.isTrue("a0aaaaaaaaaaaaaa"[dartx.contains](re));
+  };
+  dart.fn(issue_19193_test.main, VoidTodynamic());
+  // Exports:
+  exports.issue_19193_test = issue_19193_test;
+});