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+++ b/library/log4php/filters/LoggerFilterStringMatch.php
@@ -0,0 +1,89 @@
+<?php
+/**
+ * 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.
+ *
+ * @package log4php
+ */
+
+/**
+ * This is a very simple filter based on string matching.
+ *
+ * <p>The filter admits two options {@link $stringToMatch} and
+ * {@link $acceptOnMatch}. If there is a match (using {@link PHP_MANUAL#strpos}
+ * between the value of the {@link $stringToMatch} option and the message
+ * of the {@link LoggerLoggingEvent},
+ * then the {@link decide()} method returns {@link LoggerFilter::ACCEPT} if
+ * the <b>AcceptOnMatch</b> option value is true, if it is false then
+ * {@link LoggerFilter::DENY} is returned. If there is no match, {@link LoggerFilter::NEUTRAL}
+ * is returned.</p>
+ *
+ * <p>
+ * An example for this filter:
+ *
+ * {@example ../../examples/php/filter_stringmatch.php 19}
+ *
+ * <p>
+ * The corresponding XML file:
+ *
+ * {@example ../../examples/resources/filter_stringmatch.xml 18}
+ *
+ * @version $Revision: 1213283 $
+ * @package log4php
+ * @subpackage filters
+ * @since 0.3
+ */
+class LoggerFilterStringMatch extends LoggerFilter {
+
+    /**
+     * @var boolean
+     */
+    protected $acceptOnMatch = true;
+
+    /**
+     * @var string
+     */
+    protected $stringToMatch;
+
+    /**
+     * @param mixed $acceptOnMatch a boolean or a string ('true' or 'false')
+     */
+    public function setAcceptOnMatch($acceptOnMatch) {
+        $this->setBoolean('acceptOnMatch', $acceptOnMatch);
+    }
+
+    /**
+     * @param string $s the string to match
+     */
+    public function setStringToMatch($string) {
+        $this->setString('stringToMatch', $string);
+    }
+
+    /**
+     * @return integer a {@link LOGGER_FILTER_NEUTRAL} is there is no string match.
+     */
+    public function decide(LoggerLoggingEvent $event) {
+        $msg = $event->getRenderedMessage();
+
+        if ($msg === null or $this->stringToMatch === null) {
+            return LoggerFilter::NEUTRAL;
+        }
+
+        if (strpos($msg, $this->stringToMatch) !== false) {
+            return ($this->acceptOnMatch) ? LoggerFilter::ACCEPT : LoggerFilter::DENY;
+        }
+        return LoggerFilter::NEUTRAL;
+    }
+}