conf/regex-normalize.xml.template

<?xml version="1.0"?>
<!--
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 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
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     http://www.apache.org/licenses/LICENSE-2.0

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 distributed under the License is distributed on an "AS IS" BASIS,
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 See the License for the specific language governing permissions and
 limitations under the License.
-->
<!-- This is the configuration file for the RegexUrlNormalize Class.
     This is intended so that users can specify substitutions to be
     done on URLs using the Java regex syntax, see
     https://docs.oracle.com/javase/8/docs/api/java/util/regex/Pattern.html
     The rules are applied to URLs in the order they occur in this file.  -->

<!-- WATCH OUT: an xml parser reads this file an ampersands must be
     expanded to &amp; -->

<!-- The following rules show how to strip out session IDs, default pages, 
     interpage anchors, etc. Order does matter!  -->
<regex-normalize>

<!-- removes session ids from urls (such as jsessionid and PHPSESSID) -->
<regex>
  <pattern>(?i)(;?\b_?(l|j|bv_)?(sid|phpsessid|sessionid)=.*?)(\?|&amp;|#|$)</pattern>
  <substitution>$4</substitution>
</regex>

<!-- changes default pages into standard for /index.html, etc. into /
<regex>
  <pattern>/((?i)index|default)\.((?i)js[pf]{1}?[afx]?|cgi|cfm|asp[x]?|[psx]?htm[l]?|php[3456]?)(\?|&amp;|#|$)</pattern>
  <substitution>/$3</substitution>
</regex> -->

<!-- removes interpage href anchors such as site.com#location -->
<regex>
  <pattern>#.*?(\?|&amp;|$)</pattern>
  <substitution>$1</substitution>
</regex>

<!-- cleans ?&amp;var=value into ?var=value -->
<regex>
  <pattern>\?&amp;</pattern>
  <substitution>\?</substitution>
</regex>

<!-- cleans multiple sequential ampersands into a single ampersand -->
<regex>
  <pattern>&amp;{2,}</pattern>
  <substitution>&amp;</substitution>
</regex>

<!-- removes trailing ? -->
<regex>
  <pattern>[\?&amp;\.]$</pattern>
  <substitution></substitution>
</regex>

<!-- normalize file:/// protocol prefix: -->
<!--  keep one single slash (NUTCH-1483) -->
<regex>
  <pattern>^file://+</pattern>
  <substitution>file:/</substitution>
</regex>

<!-- removes duplicate slashes but -->
<!-- * allow 2 slashes after colon ':' (indicating protocol) -->
<regex>
  <pattern>(?&lt;!:)/{2,}</pattern>
  <substitution>/</substitution>
</regex>

</regex-normalize>