https://bz.apache.org/bugzilla/show_bug.cgi?id=58988

--- Comment #7 from Stefan <stefan.h...@drv-bund.de> ---
With backslash
---
RewriteRule    ^/context/id=(\w{3})(\d{12}).*$         
%{CONTEXT_PATH}/site/form/?mode=search&key=Help\%20Desk&key2="$1$2" [NC,NE,L]

RESULT - wrong URL
         fqdn/context/site/form/?mode=search&key=Help%2520Desk&key2="1234"

Without backslash
---
RewriteRule    ^/context/id=(\w{3})(\d{12}).*$         
%{CONTEXT_PATH}/site/form/?mode=search&key=Help%20Desk&key2="$1$2" [NC,NE,L]

RESULT - Exception
10-Nov-2017 16:03:52.643 SCHWERWIEGEND [http-nio-80-exec-28]
org.apache.coyote.http11.Http11Processor.service Error processing request
 java.lang.NullPointerException
        at
org.apache.catalina.valves.rewrite.Substitution$RewriteCondBackReferenceElement.evaluate(Substitution.java:65)
        at
org.apache.catalina.valves.rewrite.Substitution.evaluate(Substitution.java:269)
        at
org.apache.catalina.valves.rewrite.RewriteRule.evaluate(RewriteRule.java:135)
        at
org.apache.catalina.valves.rewrite.RewriteValve.invoke(RewriteValve.java:313)
        at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
        at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
        at
org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:799)
        at
org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
        at
org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868)
        at
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1457)
        at
org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
        at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
        at java.lang.Thread.run(Thread.java:748)

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