Fix bug 254 - incorrect value of lastIndex for global regexp test.

test/mjsunit/regress/regress-254.js

Index: test/mjsunit/regress/regress-254.js
diff --git a/test/mjsunit/regress/regress-254.js b/test/mjsunit/regress/regress-254.js
new file mode 100755
index 0000000000000000000000000000000000000000..bc8ea1fa821f94b714442bc6439e14f955a6298f
--- /dev/null
+++ b/test/mjsunit/regress/regress-254.js
@@ -0,0 +1,58 @@
+// Copyright 2009 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.
+
+// See: http://code.google.com/p/v8/issues/detail?id=254
+
+// RegExp with global flag: exec and test updates lastIndex.
+var re = /x/g;
+
+assertEquals(0, re.lastIndex, "Global, initial lastIndex");
+
+assertTrue(re.test("x"), "Global, test 1");
+assertEquals(1, re.lastIndex, "Global, lastIndex after test 1");
+assertFalse(re.test("x"), "Global, test 2");
+assertEquals(0, re.lastIndex, "Global, lastIndex after test 2");
+
+assertEquals(["x"], re.exec("x"), "Global, exec 1");
+assertEquals(1, re.lastIndex, "Global, lastIndex after exec 1");
+assertEquals(null, re.exec("x"), "Global, exec 2");
+assertEquals(0, re.lastIndex, "Global, lastIndex after exec 2");
+
+// RegExp without global flag: exec and test leavs lastIndex at zero.
+var re2 = /x/;
+
+assertEquals(0, re2.lastIndex, "Non-global, initial lastIndex");
+
+assertTrue(re2.test("x"), "Non-global, test 1");
+assertEquals(0, re2.lastIndex, "Non-global, lastIndex after test 1");
+assertTrue(re2.test("x"), "Non-global, test 2");
+assertEquals(0, re2.lastIndex, "Non-global, lastIndex after test 2");
+
+assertEquals(["x"], re2.exec("x"), "Non-global, exec 1");
+assertEquals(0, re2.lastIndex, "Non-global, lastIndex after exec 1");
+assertEquals(["x"], re2.exec("x"), "Non-global, exec 2");
+assertEquals(0, re2.lastIndex, "Non-global, lastIndex after exec 2");