Variable: whitespace-indentation-regexp

whitespace-indentation-regexp is a customizable variable defined in whitespace.el.gz.

Value

("^	*\\(\\( \\{%d\\}\\)+\\)[^\n	]" . "^ *\\(	+\\).")

Documentation

Regexps to match indentation whitespace that should be visualized.

The value should be a cons whose car specifies the regexp to match visualization of SPACEs, and the cdr specifies the regexp to match visualization of TABs.

The indentation characters are highlighted using the whitespace-indentation face. This variable is used when whitespace-style includes indentation,
indentation::tab or indentation::space.

Source Code

;; Defined in /usr/src/emacs/lisp/whitespace.el.gz
(defcustom whitespace-indentation-regexp
  '("^\t*\\(\\( \\{%d\\}\\)+\\)[^\n\t]"
    . "^ *\\(\t+\\).")
  "Regexps to match indentation whitespace that should be visualized.

The value should be a cons whose car specifies the regexp to match
visualization of SPACEs, and the cdr specifies the regexp to match
visualization of TABs.

The indentation characters are highlighted using the `whitespace-indentation'
face.
This variable is used when `whitespace-style' includes `indentation',
`indentation::tab' or  `indentation::space'."
  :type '(cons (string :tag "Indentation SPACEs")
	       (regexp :tag "Indentation TABs")))