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+// 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.
+
+
+// Test that an optional capture is cleared between two matches.
+var str = "ABX X";
+str = str.replace(/(\w)?X/g, function(match, capture) {
+                               assertTrue(match.indexOf(capture) >= 0 ||
+                                           capture === undefined);
+                               return capture ? capture.toLowerCase() : "-";
+                             });
+assertEquals("Ab -", str);
+
+// Test zero-length matches.
+str = "Als Gregor Samsa eines Morgens";
+str = str.replace(/\b/g, function(match, capture) {
+                           return "/";
+                         });
+assertEquals("/Als/ /Gregor/ /Samsa/ /eines/ /Morgens/", str);
+
+// Test zero-length matches that have non-zero-length sub-captures.
+str = "It was a pleasure to burn.";
+str = str.replace(/(?=(\w+))\b/g, function(match, capture) {
+                                    return capture.length;
+                                  });
+assertEquals("2It 3was 1a 8pleasure 2to 4burn.", str);
+
+// Test multiple captures.
+str = "Try not. Do, or do not. There is no try.";
+str = str.replace(/(not?)|(do)|(try)/gi,
+                  function(match, c1, c2, c3) {
+                    assertTrue((c1 === undefined && c2 === undefined) ||
+                               (c2 === undefined && c3 === undefined) ||
+                               (c1 === undefined && c3 === undefined));
+                    if (c1) return "-";
+                    if (c2) return "+";
+                    if (c3) return "="
+                  });
+assertEquals("= -. +, or + -. There is - =.", str);
+
+// Test multiple alternate captures.
+str = "FOUR LEGS GOOD, TWO LEGS BAD!";
+str = str.replace(/(FOUR|TWO) LEGS (GOOD|BAD)/g,
+                  function(match, num_legs, likeability) {
+                    assertTrue(num_legs !== undefined);
+                    assertTrue(likeability !== undefined);
+                    if (num_legs == "FOUR") assertTrue(likeability == "GOOD");
+                    if (num_legs == "TWO") assertTrue(likeability == "BAD");
+                    return match.length - 10;
+                  });
+assertEquals("4, 2!", str);
+
+
+// The same tests with UC16.
+
+//Test that an optional capture is cleared between two matches.
+str = "AB\u1234 \u1234";
+str = str.replace(/(\w)?\u1234/g,
+                  function(match, capture) {
+                    assertTrue(match.indexOf(capture) >= 0 ||
+                               capture === undefined);
+                    return capture ? capture.toLowerCase() : "-";
+                  });
+assertEquals("Ab -", str);
+
+// Test zero-length matches.
+str = "Als \u2623\u2642 eines Morgens";
+str = str.replace(/\b/g, function(match, capture) {
+                           return "/";
+                         });
+assertEquals("/Als/ \u2623\u2642 /eines/ /Morgens/", str);
+
+// Test zero-length matches that have non-zero-length sub-captures.
+str = "It was a pleasure to \u70e7.";
+str = str.replace(/(?=(\w+))\b/g, function(match, capture) {
+                                    return capture.length;
+                                  });
+assertEquals("2It 3was 1a 8pleasure 2to \u70e7.", str);
+
+// Test multiple captures.
+str = "Try not. D\u26aa, or d\u26aa not. There is no try.";
+str = str.replace(/(not?)|(d\u26aa)|(try)/gi,
+                  function(match, c1, c2, c3) {
+                    assertTrue((c1 === undefined && c2 === undefined) ||
+                               (c2 === undefined && c3 === undefined) ||
+                               (c1 === undefined && c3 === undefined));
+                    if (c1) return "-";
+                    if (c2) return "+";
+                    if (c3) return "="
+                  });
+assertEquals("= -. +, or + -. There is - =.", str);
+
+// Test multiple alternate captures.
+str = "FOUR \u817f GOOD, TWO \u817f BAD!";
+str = str.replace(/(FOUR|TWO) \u817f (GOOD|BAD)/g,
+                  function(match, num_legs, likeability) {
+                    assertTrue(num_legs !== undefined);
+                    assertTrue(likeability !== undefined);
+                    if (num_legs == "FOUR") assertTrue(likeability == "GOOD");
+                    if (num_legs == "TWO") assertTrue(likeability == "BAD");
+                    return match.length - 7;
+                  });
+assertEquals("4, 2!", str);
+
+// Test capture that is a real substring.
+var str = "Beasts of England, beasts of Ireland";
+str = str.replace(/(.*)/g, function(match) { return '~'; });
+assertEquals("~~", str);
+
+// Test zero-length matches that have non-zero-length sub-captures that do not
+// start at the match start position.
+str = "up up up up";
+str = str.replace(/\b(?=u(p))/g, function(match, capture) {
+                                    return capture.length;
+                                  });
+
+assertEquals("1up 1up 1up 1up", str);
+
+
+// Create regexp that has a *lot* of captures.
+var re_string = "(a)";
+for (var i = 0; i < 500; i++) {
+  re_string = "(" + re_string + ")";
+}
+re_string = re_string + "1";
+// re_string = "(((...((a))...)))1"
+
+var regexps = new Array();
+var last_match_expectations = new Array();
+var first_capture_expectations = new Array();
+
+// Atomic regexp.
+regexps.push(/a1/g);
+last_match_expectations.push("a1");
+first_capture_expectations.push("");
+// Small regexp (no capture);
+regexps.push(/\w1/g);
+last_match_expectations.push("a1");
+first_capture_expectations.push("");
+// Small regexp (one capture).
+regexps.push(/(a)1/g);
+last_match_expectations.push("a1");
+first_capture_expectations.push("a");
+// Large regexp (a lot of captures).
+regexps.push(new RegExp(re_string, "g"));
+last_match_expectations.push("a1");
+first_capture_expectations.push("a");
+
+function test_replace(result_expectation,
+                      subject,
+                      regexp,
+                      replacement) {
+  for (var i = 0; i < regexps.length; i++) {
+    // Overwrite last match info.
+    "deadbeef".replace(/(dead)beef/, "$1holeycow");
+    // Conduct tests.
+    assertEquals(result_expectation, subject.replace(regexps[i], replacement));
+    if (subject.length == 0) {
+      assertEquals("deadbeef", RegExp.lastMatch);
+      assertEquals("dead", RegExp["$1"]);
+    } else {
+      assertEquals(last_match_expectations[i], RegExp.lastMatch);
+      assertEquals(first_capture_expectations[i], RegExp["$1"]);
+    }
+  }
+}
+
+
+function test_match(result_expectation,
+                    subject,
+                    regexp) {
+  for (var i = 0; i < regexps.length; i++) {
+    // Overwrite last match info.
+    "deadbeef".replace(/(dead)beef/, "$1holeycow");
+    // Conduct tests.
+    if (result_expectation == null) {
+      assertNull(subject.match(regexps[i]));
+    } else {
+      assertArrayEquals(result_expectation, subject.match(regexps[i]));
+    }
+    if (subject.length == 0) {
+      assertEquals("deadbeef", RegExp.lastMatch);
+      assertEquals("dead", RegExp["$1"]);
+    } else {
+      assertEquals(last_match_expectations[i], RegExp.lastMatch);
+      assertEquals(first_capture_expectations[i], RegExp["$1"]);
+    }
+  }
+}
+
+
+// Test for different number of matches.
+for (var m = 0; m < 200; m++) {
+  // Create string that matches m times.
+  var subject = "";
+  var test_1_expectation = "";
+  var test_2_expectation = "";
+  var test_3_expectation = (m == 0) ? null : new Array();
+  for (var i = 0; i < m; i++) {
+    subject += "a11";
+    test_1_expectation += "x1";
+    test_2_expectation += "1";
+    test_3_expectation.push("a1");
+  }
+
+  // Test 1a: String.replace with string.
+  test_replace(test_1_expectation, subject, /a1/g, "x");
+
+  // Test 1b: String.replace with function.
+  function f() { return "x"; }
+  test_replace(test_1_expectation, subject, /a1/g, f);
+
+  // Test 2a: String.replace with empty string.
+  test_replace(test_2_expectation, subject, /a1/g, "");
+
+  // Test 3a: String.match.
+  test_match(test_3_expectation, subject, /a1/g);
+}
+
+
+// Test String hashing (compiling regular expression includes hashing).
+var crosscheck = "\x80";
+for (var i = 0; i < 12; i++) crosscheck += crosscheck;
+new RegExp(crosscheck);
+
+var subject = "ascii~only~string~here~";
+var replacement = "\x80";
+var result = subject.replace(/~/g, replacement);
+for (var i = 0; i < 5; i++) result += result;
+new RegExp(result);