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

test/mjsunit/regexp.js

Index: test/mjsunit/regexp.js
diff --git a/test/mjsunit/regexp.js b/test/mjsunit/regexp.js
index 5c8088c6655a2676a087feaa8416bc21cf17a3e7..412432cf34fc7f02ae0fda48971bca0fdfb40be8 100644
--- a/test/mjsunit/regexp.js
+++ b/test/mjsunit/regexp.js
@@ -263,4 +263,43 @@ assertTrue(/foo$(?!bar)/.test("foo"), "football12");
 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");