Variable: eshell-integer-regexp
eshell-integer-regexp is a variable defined in esh-util.el.gz.
Value
"-?[[:digit:]]+"
Documentation
Regular expression used to match integer arguments.
Source Code
;; Defined in /usr/src/emacs/lisp/eshell/esh-util.el.gz
(defvar eshell-integer-regexp (rx (? "-") (+ digit))
"Regular expression used to match integer arguments.")