Hi,

I'm using the Harbottle packages for tomcat (tomcat8-8.5.55-1.el7.harbottle.x86_64
tomcat8-native-1.2.24-1.el7.harbottle.x86_64) on a CentOS 7 machine. I have a RewriteValve configured with something structurally identical to this:

===
RewriteCond	%{ENV:orig_REQUEST_URI}	^[^/].*
RewriteRule	(.*)	$1	[E=orig_REQUEST_URI:%{REQUEST_URI}]

RewriteRule	^/OldURI23(.*)	/NewerURIIsHere45$1
===

When accessing this directory (it is the docBase directory, and has an index.html as main page), a 404 page is returned that /NewerURIIsHere45/index.html is not found. Commenting out the last line, or the first two lines and restarting tomcat will make it work again. If the last line is changed to 

RewriteRule	^/OldURI23()(.*)	/NewerURIIsHere45$1$2

any access will throw an error that there is no group 2. Which suggests the wrong regexp match is consulted here.