text: // 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.
  
  // Summary of the spec: lastIndex is reset to 0 if
  // - a global or sticky regexp fails to match.
  // - a global regexp is used in a function that returns multiple results,
  //   such as String.prototype.replace or String.prototype.match, since it
  //   repeats the regexp until it fails to match.
  // Otherwise lastIndex is only set when a global regexp matches, to the index
  // after the match.
  
  // Test Regexp.prototype.exec
  r = /a/;
  r.lastIndex = 1;
  r.exec("zzzz");
  assertEquals(1, r.lastIndex);
  
  // Test Regexp.prototype.test
  r = /a/;
  r.lastIndex = 1;
  r.test("zzzz");
  assertEquals(1, r.lastIndex);
  
  // Test String.prototype.match
  r = /a/;
  r.lastIndex = 1;
  "zzzz".match(r);
  assertEquals(1, r.lastIndex);
  
  // Test String.prototype.replace with atomic regexp and empty string.
  r = /a/;
  r.lastIndex = 1;
  "zzzz".replace(r, "");
  assertEquals(0, r.lastIndex);
  
  // Test String.prototype.replace with non-atomic regexp and empty string.
  r = /\d/;
  r.lastIndex = 1;
  "zzzz".replace(r, "");
  assertEquals(0, r.lastIndex);
  
  // Test String.prototype.replace with atomic regexp and non-empty string.
  r = /a/;
  r.lastIndex = 1;
  "zzzz".replace(r, "a");
  assertEquals(0, r.lastIndex);
  
  // Test String.prototype.replace with non-atomic regexp and non-empty string.
  r = /\d/;
  r.lastIndex = 1;
  "zzzz".replace(r, "a");
  assertEquals(0, r.lastIndex);
  
  // Test String.prototype.replace with replacement function
  r = /a/;
  r.lastIndex = 1;
  "zzzz".replace(r, function() { return ""; });
  assertEquals(0, r.lastIndex);
  
  // Regexp functions that returns multiple results:
  // A global regexp always resets lastIndex regardless of whether it matches.
  r = /a/g;
  r.lastIndex = -1;
  "0123abcd".replace(r, "x");
  assertEquals(0, r.lastIndex);
  
  r.lastIndex = -1;
  "01234567".replace(r, "x");
  assertEquals(0, r.lastIndex);
  
  r.lastIndex = -1;
  "0123abcd".match(r);
  assertEquals(0, r.lastIndex);
  
  r.lastIndex = -1;
  "01234567".match(r);
  assertEquals(0, r.lastIndex);
  
  // A non-global regexp resets lastIndex iff it does not match.
  r = /a/;
  r.lastIndex = -1;
  "0123abcd".replace(r, "x");
  assertEquals(-1, r.lastIndex);
  
  r.lastIndex = -1;
  "01234567".replace(r, "x");
  assertEquals(0, r.lastIndex);
  
  r.lastIndex = -1;
  "0123abcd".match(r);
  assertEquals(-1, r.lastIndex);
  
  r.lastIndex = -1;
  "01234567".match(r);
  assertEquals(-1, r.lastIndex);
  
  // Also test RegExp.prototype.exec and RegExp.prototype.test
  r = /a/g;
  r.lastIndex = 1;
  r.exec("01234567");
  assertEquals(0, r.lastIndex);
  
  r.lastIndex = 1;
  r.exec("0123abcd");
  assertEquals(5, r.lastIndex);
  
  r = /a/;
  r.lastIndex = 1;
  r.exec("01234567");
  assertEquals(1, r.lastIndex);
  
  r.lastIndex = 1;
  r.exec("0123abcd");
  assertEquals(1, r.lastIndex);
  
  r = /a/g;
  r.lastIndex = 1;
  r.test("01234567");
  assertEquals(0, r.lastIndex);
  
  r.lastIndex = 1;
  r.test("0123abcd");
  assertEquals(5, r.lastIndex);
  
  r = /a/;
  r.lastIndex = 1;
  r.test("01234567");
  assertEquals(1, r.lastIndex);
  
  r.lastIndex = 1;
  r.test("0123abcd");
  assertEquals(1, r.lastIndex);
  