log4j-core-test/src/test/resources/log4j-replace.xml

<?xml version="1.0" encoding="UTF-8"?>
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<Configuration status="OFF" name="RegexReplacementTest">
  <Appenders>
    <List name="List">
       <PatternLayout>
         <Replace regex="\." replacement="/"/>
         <Pattern>%logger %msg{lookups}%n</Pattern>
      </PatternLayout>
    </List>
    <List name="List2">
       <PatternLayout>
         <Pattern>%replace{%logger %C{1.} %msg{lookups}%n}{\.}{/}</Pattern>
      </PatternLayout>
    </List>
  </Appenders>

  <Loggers>
    <Logger level="trace" name="ReplacementTest" additivity="false">
      <AppenderRef ref="List2"/>
    </Logger>
    <Root level="trace">
      <AppenderRef ref="List"/>
    </Root>
  </Loggers>

</Configuration>