Fix spec violations related to regexp.lastIndex

test/mjsunit/regress/regress-2437.js

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-// Flags: --allow-natives-syntax
+// Test Regexp.prototype.exec
+r = /a/;
+r.lastIndex = 1;
+r.exec("zzzz");
+assertEquals(0, r.lastIndex);
 
-// Test optimized closures.
+// Test Regexp.prototype.test
+r = /a/;
+r.lastIndex = 1;
+r.test("zzzz");
+assertEquals(0, r.lastIndex);
 
-var a = new Array(100);
+// Test String.prototype.match
+r = /a/;
+r.lastIndex = 1;
+"zzzz".match(r);
+assertEquals(0, r.lastIndex);
 
-function f() {
-  var x=0;
-  for (var i=0; i<100; i++) {
-    var g = function goo(y) {
-      function h() {
-        if (goo.arguments[0] == 23) return -42;
-        return 42;
-      }
-      return x + y + h(y);
-    }
-    g(0);
-    %OptimizeFunctionOnNextCall(g);
-    a[i] = g(i);
-  }
-}
+// Test String.prototype.replace with atomic regexp and empty string.
+r = /a/;
+r.lastIndex = 1;
+"zzzz".replace(r, "");
+assertEquals(0, r.lastIndex);
 
-f();
-assertEquals(42, a[0]);
-assertEquals(49, a[7]);
-assertEquals(-19, a[23]);
+// 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);