eshell-tar-regexp

eshell-tar-regexp is a variable defined in `esh-util.el'.
Its value is

"\\.t\\(ar\\(\\.\\(gz\\|bz2\\|xz\\|Z\\)\\)?\\|gz\\|a[zZ]\\|z2\\)\\'"

Documentation:
Regular expression used to match tar file names.

You can customize this variable.

This variable was introduced, or its default value was changed, in version 24.1 of Emacs.