First, why would you use perl when grep does just fine? grep '\.[cC]$' is way more succinct. Unix is not just an environment for running perl, you know!

Second, as just a minor nit, you're missing the v option for tar - without which, your tar command will print out, well, nothing. tar tvzf file.tar.gz | ...

On my RedHat 9 linux system, tar tzf provides output without needing the v.

Also grep is a bit different on different systems, and I believe regexes need to be grep -e or use egrep. Anyway I like perl, it works better for me..