[zendframework/zendframework#3376] Added test for new behavior

- Added a test displaying that an exception is raised when passing the
  "e" modifier in a pattern

test/PregReplaceTest.php

@@ -97,4 +97,11 @@ public function testFilterThrowsExceptionWhenNoMatchPatternPresent()
                                     'does not have a valid pattern set');
         $filtered = $filter($string);
     }
+
+    public function testPassingPatternWithExecModifierRaisesException()
+    {
+        $filter = new PregReplaceFilter();
+        $this->setExpectedException('Zend\Filter\Exception\InvalidArgumentException', '"e" pattern modifier');
+        $filter->setPattern('/foo/e');
+    }
 }