How can I set .gitignore to ignore all .jars but not in the expected folder

Question

I have a project structure like this:

/proj/a/file.jar
/proj/a/1/file.jar
/proj/b/file.jar
/proj/b/1/file.jar
/proj/b/2/1/file.jar
/proj/c/file.jar
/proj/c/1/file.jar
/proj/c/2/1/file.jar

etc.

I'm trying to ignore all jar files except those in c folder and all nested ones. How should I set this in .gitignore?

*.jar
!c/*.jar

doesn't work. This too:

*.jar
!c/*/*.jar

and this:

*.jar
!/proj/c/*/*.jar

and this:

*.jar
!/proj/c/**/*.jar

Am I miss something?

Answer 1

Git does not support a **-style wildcard so you can either use full paths (i.e. /whatever/*/*/*.jar etc.) for to reflect the correct amounts of directory levels or you can simply put .gitignore files containing !*.jar inside the folders where you want to unignore JAR files.