* Implemented case-insensitive back-reference matching in irregexp-ia32.

test/mjsunit/regexp.js

 // Copyright 2008 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
@@ skipping 245 matching lines @@
 assertFalse(/foo$(?!bar)/.test("football"), "football9");
 assertTrue(/(x?)foo$\1/.test("foo"), "football10");
 assertTrue(/foo$(?=(ball)?)/.test("foo"), "football11");
 assertTrue(/foo$(?!bar)/.test("foo"), "football12");
 
 // Check that the back reference has two successors.  See
 // BackReferenceNode::PropagateForward.
 assertFalse(/f(o)\b\1/.test('foo'));
 assertTrue(/f(o)\B\1/.test('foo'));
 
+// Back-reference, ignore case:
+// ASCII
+assertEquals("xaAx,a", String(/x(a)\1x/i.exec("xaAx")), "\\1 ASCII");
+assertFalse(/x(...)\1/i.test("xaaaaa"), "\\1 ASCII, string short");
+assertTrue(/x((?:))\1\1x/i.test("xx"), "\\1 empty, ASCII");
+assertTrue(/x(?:...|(...))\1x/i.test("xabcx"), "\\1 uncaptured, ASCII");
+assertTrue(/x(?:...|(...))\1x/i.test("xabcABCx"), "\\1 backtrack, ASCII");
+assertEquals("xaBcAbCABCx,aBc",
+             String(/x(...)\1\1x/i.exec("xaBcAbCABCx")),
+             "\\1\\1 ASCII");
+
+for (var i = 0; i < 128; i++) {
+  var testName = "(.)\\1 ~ " + i + "," + (i^0x20);
+  var test = /^(.)\1$/i.test(String.fromCharCode(i, i ^ 0x20))
+  var c = String.fromCharCode(i);
+  if (('A' <= c && c <= 'Z') || ('a' <= c && c <= 'z')) {
+    assertTrue(test, testName);
+  } else {
+    assertFalse(test, testName);
+  }
+}
+
+// UC16
+// Characters used:
+// "\u03a3\u03c2\u03c3\u039b\u03bb" - Sigma, final sigma, sigma, Lambda, lamda
+assertEquals("x\u03a3\u03c3x,\u03a3",
+              String(/x(.)\1x/i.exec("x\u03a3\u03c3x")), "\\1 UC16");
+assertFalse(/x(...)\1/i.test("x\u03a3\u03c2\u03c3\u03c2\u03c3"),
+            "\\1 ASCII, string short");
+assertTrue(/\u03a3((?:))\1\1x/i.test("\u03c2x"), "\\1 empty, UC16");
+assertTrue(/x(?:...|(...))\1x/i.test("x\u03a3\u03c2\u03c3x"),
+           "\\1 uncaptured, UC16");
+assertTrue(/x(?:...|(...))\1x/i.test("x\u03c2\u03c3\u039b\u03a3\u03c2\u03bbx"), 
+           "\\1 backtrack, UC16");
+var longUC16String = "x\u03a3\u03c2\u039b\u03c2\u03c3\u03bb\u03c3\u03a3\u03bb";
+assertEquals(longUC16String + "," + longUC16String.substring(1,4),
+             String(/x(...)\1\1/i.exec(longUC16String)),
+             "\\1\\1 UC16");
+
 assertFalse(/f(o)$\1/.test('foo'), "backref detects at_end");