Make regexp flag parsing stricter.

test/mjsunit/regress/regress-87.js

Index: test/mjsunit/regress/regress-87.js
diff --git a/test/mjsunit/regress/regress-87.js b/test/mjsunit/regress/regress-87.js
index 131cb58edc12957445badfe5b7ee6cf43d935442..10446fdf45ab115b21bac47495bbe5bb035d242e 100644
--- a/test/mjsunit/regress/regress-87.js
+++ b/test/mjsunit/regress/regress-87.js
@@ -25,34 +25,29 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-function testFlags(flagstring, global, ignoreCase, multiline) {
-  var text = "/x/"+flagstring;
-  var re = eval(text);
-  assertEquals(global, re.global, text + ".global");
-  assertEquals(ignoreCase, re.ignoreCase, text + ".ignoreCase");
-  assertEquals(multiline, re.multiline, text + ".multiline");
-}
-
-testFlags("", false, false, false);
-
-testFlags("\u0067", true, false, false);
-
-testFlags("\u0069", false, true, false)
-
-testFlags("\u006d", false, false, true);
-
-testFlags("\u0068", false, false, false);
-
-testFlags("\u0020", false, false, false);
-
-
-testFlags("\u0067g", true, false, false);
-
-testFlags("g\u0067", true, false, false);
-
-testFlags("abc\u0067efg", true, false, false);
-
-testFlags("i\u0067", true, true, false);
-
-testFlags("\u0067i", true, true, false);
-
+// In Issue 87, we allowed unicode escape sequences in RegExp flags.
+// However, according to ES5, they should not be interpreted, but passed
+// verbatim to the RegExp constructor.
+// (On top of that, the original test was bugged and never tested anything).
+// The behavior was changed in r8969 to not interpret escapes, but this
+// test didn't test that, and only failed when making invalid flag characters
+// an error too.
+
+assertThrows("/x/\\u0067");
+assertThrows("/x/\\u0069");
+assertThrows("/x/\\u006d");
+
+assertThrows("/x/\\u0067i");
+assertThrows("/x/\\u0069m");
+assertThrows("/x/\\u006dg");
+
+assertThrows("/x/m\\u0067");
+assertThrows("/x/g\\u0069");
+assertThrows("/x/i\\u006d");
+
+assertThrows("/x/m\\u0067i");
+assertThrows("/x/g\\u0069m");
+assertThrows("/x/i\\u006dg");
+
+assertThrows("/x/\\u0068");
+assertThrows("/x/\\u0020");