sed doesnt convert varibale values???

[Maloney, Michael]

I am using sed and for some reason, it is entering the variable name and
not the value to output. The line looks like:
sed 's/weblogic.Server/$APP_SERVER_DOMAIN weblogic.Server/' $file

The output looks like:
%JAVA_HOME%\bin\java %JAVA_VM% %MEM_ARGS% %JAVA_OPTIONS%
-Dweblogic.Name=%SERVER
_NAME% -Dweblogic.ProductionModeEnabled=%PRODUCTION_MODE%
-Djava.security.policy
="%WL_HOME%\server\lib\weblogic.policy" "$APP_SERVER_DOMAIN
weblogic.Server"

It's just putting the variable name there. I went back an looked at some
earlier scripts that I wrote for Unix and the Unix sed worked just as I
am trying to do now.

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