Reapply "Port regexp tests from V8 to Dart."

tests/corelib/regexp/results-cache_test.dart

Index: tests/corelib/regexp/results-cache_test.dart
diff --git a/tests/corelib/regexp/results-cache_test.dart b/tests/corelib/regexp/results-cache_test.dart
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+++ b/tests/corelib/regexp/results-cache_test.dart
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+// Copyright (c) 2014, the Dart project authors. All rights reserved.
+// Copyright 2012 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
+//       disclaimer in the documentation and/or other materials provided
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+import 'v8_regexp_utils.dart';
+import 'package:expect/expect.dart';
+
+void main() {
+  // Long string to trigger caching.
+  var string =
+  """Friends, Romans, countrymen, lend me your ears!  
+  I come to bury Caesar, not to praise him.        
+  The evil that men do lives after them,           
+  The good is oft interred with their bones;       
+  So let it be with Caesar. The noble Brutus       
+  Hath told you Caesar was ambitious;              
+  If it were so, it was a grievous fault,          
+  And grievously hath Caesar answer'd it.          
+  Here, under leave of Brutus and the rest-        
+  For Brutus is an honorable man;                  
+  So are they all, all honorable men-              
+  Come I to speak in Caesar's funeral.             
+  He was my friend, faithful and just to me;       
+  But Brutus says he was ambitious,                
+  And Brutus is an honorable man.                  
+  He hath brought many captives home to Rome,      
+  Whose ransoms did the general coffers fill.      
+  Did this in Caesar seem ambitious?               
+  When that the poor have cried, Caesar hath wept; 
+  Ambition should be made of sterner stuff:        
+  Yet Brutus says he was ambitious,                
+  And Brutus is an honorable man.                  
+  You all did see that on the Lupercal             
+  I thrice presented him a kingly crown,           
+  Which he did thrice refuse. Was this ambition?   
+  Yet Brutus says he was ambitious,                
+  And sure he is an honorable man.                 
+  I speak not to disprove what Brutus spoke,       
+  But here I am to speak what I do know.           
+  You all did love him once, not without cause;    
+  What cause withholds you then to mourn for him?  
+  O judgement, thou art fled to brutish beasts,    
+  And men have lost their reason. Bear with me;    
+  My heart is in the coffin there with Caesar,     
+  And I must pause till it come back to me.""";
+
+  var replaced = string.replaceAll(new RegExp(r"\b\w+\b"), "foo");
+  for (var i = 0; i < 3; i++) {
+    assertEquals(replaced,
+                string.replaceAll(new RegExp(r"\b\w+\b"), "foo"));
+  }
+
+  // Check that the result is in a COW array.
+  var words = string.split(" ");
+  assertEquals("Friends,", words[0]);
+  words[0] = "Enemies,";
+  words = string.split(" ");
+  assertEquals("Friends,", words[0]);
+}