- Add new test for regex

corelib/src/RegExp4Test.dart

Index: corelib/src/RegExp4Test.dart
===================================================================
--- corelib/src/RegExp4Test.dart	(revision 0)
+++ corelib/src/RegExp4Test.dart	(revision 0)
@@ -0,0 +1,47 @@
+// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+// Dart test for testing regular expressions in Dart.
+
+main() {
+  try {
+    RegExp ex = const RegExp(null);
+    Expect.fail("Expected: NullPointerException got: no exception");
+  } catch (Exception ex) {
+    if (!(ex is NullPointerException)) {
+      Expect.fail("Expected: NullPointerException" + " got: ${ex}");
+    }
+  }
+  try {
+    const RegExp(@"^\w+$").hasMatch(null);
+    Expect.fail("Expected: NullPointerException got: no exception");
+  } catch (Exception ex) {
+    if (!(ex is NullPointerException)) {
+      Expect.fail("Expected: NullPointerException" + " got: ${ex}");
+    }
+  }
+  try {
+    const RegExp(@"^\w+$").firstMatch(null);
+    Expect.fail("Expected: NullPointerException got: no exception");
+  } catch (Exception ex) {
+    if (!(ex is NullPointerException)) {
+      Expect.fail("Expected: NullPointerException" + " got: ${ex}");
+    }
+  }
+  try {
+    const RegExp(@"^\w+$").allMatches(null);
+    Expect.fail("Expected: NullPointerException got: no exception");
+  } catch (Exception ex) {
+    if (!(ex is NullPointerException)) {
+      Expect.fail("Expected: NullPointerException" + " got: ${ex}");
+    }
+  }
+  try {
+    const RegExp(@"^\w+$").stringMatch(null);
+    Expect.fail("Expected: NullPointerException got: no exception");
+  } catch (Exception ex) {
+    if (!(ex is NullPointerException)) {
+      Expect.fail("Expected: NullPointerException" + " got: ${ex}");
+    }
+  }
+}