How do I ignore file extensions in git regardless of case?

Question

I want to tell git to ignore e.g. jpg files regardless of how the extension is written.

e.g.

*.jpg

should ignore

Answer 1

Git ignore understands glob pattern, so you can use this

*.[jJ][pP][gG]

Answer 2

You can tell git to ignore case in most situations, including in your .gitignore files. All you need is:

git config core.ignorecase true

From a practical point of view, there may be trade-offs involved. The git-config(1) man page says:

   core.ignorecase
       If true, this option enables various workarounds to enable git to
       work better on filesystems that are not case sensitive, like FAT.
       For example, if a directory listing finds "makefile" when git
       expects "Makefile", git will assume it is really the same file, and
       continue to remember it as "Makefile".

       The default is false, except git-clone(1) or git-init(1) will probe
       and set core.ignorecase true if appropriate when the repository is
       created.

So, you may run into trouble if you are on a case-sensitive filesystem. Your mileage may vary.