用 sed 替换 Tomcat 中的服务器头

Question

I'm trying to automatically replace the server header in Apache Tomcat to prevent telling people I am using Apache. I'm currently using sed to try to accomplish this. I am running the below command:

sed -ir 's/(?<=server=")(.*)(?=")/IAmATeaPot/g' ./checktext.xml

I am trying change the checktext.xml in the same directory I am running the command which currently reads

Connector port="8080" ... server="Apache" />

and change it to:

Connector port="8080" ... server="IAmATeaPot" />

My regex appropriately captures the string within the quotes and works in regex checkers online, however nothing happens and I get no error. Any idea what I am doing wrong?

Answer 1

I think this will do a much cleaner job without having to deal with lookaheads and lookbehinds.

s/server="[^"]*"/server="IAmATeapot"/

You're looking for server=" and then 0 or more non- " characters, and then a closing " , and then replacing the entire thing with server="IAmATeapot" .