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diff --git a/src/main/include/log4cxx/filter/expressionfilter.h b/src/main/include/log4cxx/filter/expressionfilter.h
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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef _LOG4CXX_FILTER_EXPRESSIONFILTER_H
+#define _LOG4CXX_FILTER_EXPRESSIONFILTER_H
+
+#if defined(_MSC_VER)
+#pragma warning ( push )
+#pragma warning ( disable: 4231 4251 4275 4786 )
+#endif
+
+
+#include <log4cxx/spi/filter.h>
+
+namespace log4cxx
+{
+    namespace rule
+    {
+        class Rule;
+        typedef helpers::ObjectPtrT < Rule > RulePtr;
+    }
+
+
+    namespace filter
+    {
+
+
+/**
+ *A filter supporting complex expressions - supports both infix and postfix
+ * expressions (infix expressions must first be converted to postfix prior
+ * to processing).
+ *
+ * <p>See <code>org.apache.log4j.chainsaw.LoggingEventFieldResolver.java</code>
+ * for the correct names for logging event fields used when building expressions.
+ *
+ * <p>See <code>org.apache.log4j.chainsaw.rule</code> package for a list of available
+ * rules which can be applied using the expression syntax.
+ *
+ * <p>See <code>org.apache.log4j.chainsaw.RuleFactory</code> for the symbols
+ * used to activate the corresponding rules.
+ *
+ *NOTE:  Grouping using parentheses is supported - all tokens must be separated by spaces, and
+ *operands which contain spaces are not yet supported.
+ *
+ *Example:
+ *
+ *In order to build a filter that displays all messages with infomsg-45 or infomsg-44 in the message,
+ *as well as all messages with a level of WARN or higher, build an expression using
+ *the LikeRule (supports ORO-based regular expressions) and the InequalityRule.
+ * <b> ( MSG LIKE infomsg-4[4,5] ) && ( LEVEL >= WARN ) </b>
+ *
+ *Three options are required:
+ *  <b>Expression</b> - the expression to match
+ *  <b>ConvertInFixToPostFix</b> - convert from infix to posfix (default true)
+ *  <b>AcceptOnMatch</b> - true or false (default true)
+ *
+ * Meaning of <b>AcceptToMatch</b>:
+ * If there is a match between the value of the
+ * Expression option and the {@link log4cxx::spi::LoggingEvent} and AcceptOnMatch is true,
+ * the {@link #decide} method returns {@link log4cxx::spi::Filter#ACCEPT}.
+ *
+ * If there is a match between the value of the
+ * Expression option and the {@link log4cxx::spi::LoggingEvent} and AcceptOnMatch is false,
+ * {@link log4cxx::spi::Filter#DENY} is returned.
+ *
+ * If there is no match, {@link log4cxx::spi::Filter#NEUTRAL} is returned.
+ *
+ * 
+ */
+        class LOG4CXX_EXPORT ExpressionFilter:public log4cxx::spi::Filter
+        {
+          private:
+            bool acceptOnMatch;
+            bool convertInFixToPostFix;
+            LogString expression;
+                      log4cxx::rule::RulePtr expressionRule;
+                      ExpressionFilter(const ExpressionFilter &);
+                  ExpressionFilter & operator=(const ExpressionFilter &);
+
+          public:
+                  DECLARE_LOG4CXX_OBJECT(ExpressionFilter)
+                  BEGIN_LOG4CXX_CAST_MAP()
+                  LOG4CXX_CAST_ENTRY(log4cxx::spi::Filter)
+                  END_LOG4CXX_CAST_MAP()
+
+
+                  ExpressionFilter();
+
+            void activateOptions(log4cxx::helpers::Pool & p);
+
+            void setExpression(const LogString & expression);
+
+            LogString getExpression() const;
+
+            void setConvertInFixToPostFix(bool convertInFixToPostFix);
+
+            bool getConvertInFixToPostFix() const;
+
+            void setAcceptOnMatch(bool acceptOnMatch);
+
+            bool getAcceptOnMatch() const;
+
+  /**
+     Returns {@link log4cxx::spi::Filter#NEUTRAL} is there is no string match.
+   */
+            FilterDecision decide(const spi::LoggingEventPtr & event) const;
+        };
+    }
+}
+
+#if defined(_MSC_VER)
+#pragma warning ( pop )
+#endif
+
+
+#endif