Variable: whitespace-big-indent-regexp
whitespace-big-indent-regexp is a customizable variable defined in
whitespace.el.gz.
Value
"^\\(\\(?: \\{4,\\}\\| \\{32,\\}\\)[ ]*\\)"
Documentation
Regexp to match big indentation at BOL that should be visualized.
The indentation characters are highlighted using the whitespace-big-indent
face.
If you're using non-Latin languages, there may be other characters
besides "\\t" that should be considered a TAB.
NOTE: Always enclose the elements to highlight in \\(...\\).
Use exactly one pair of enclosing \\( and \\).
This variable is used when whitespace-style includes big-indent.
This variable was added, or its default value changed, in Emacs 25.1.
Probably introduced at or before Emacs version 25.1.
Source Code
;; Defined in /usr/src/emacs/lisp/whitespace.el.gz
(defcustom whitespace-big-indent-regexp
"^\\(\\(?:\t\\{4,\\}\\| \\{32,\\}\\)[\t ]*\\)"
"Regexp to match big indentation at BOL that should be visualized.
The indentation characters are highlighted using the `whitespace-big-indent'
face.
If you're using non-Latin languages, there may be other characters
besides \"\\t\" that should be considered a TAB.
NOTE: Always enclose the elements to highlight in \\\\(...\\\\).
Use exactly one pair of enclosing \\\\( and \\\\).
This variable is used when `whitespace-style' includes `big-indent'."
:version "25.1"
:type '(regexp :tag "Detect too much indentation at the beginning of a line"))