Variable: PC-word-delimiters
PC-word-delimiters is a customizable variable defined in
complete.el.gz.
Value
"-_. "
Documentation
A string of characters treated as word delimiters for completion.
Some arcane rules:
If ] is in this string, it must come first.
If ^ is in this string, it must not come first.
If - is in this string, it must come first or right after ].
In other words, if S is this string, then [S] must be a valid Emacs regular
expression (not containing character ranges like a-z).
Source Code
;; Defined in /usr/src/emacs/lisp/obsolete/complete.el.gz
(defcustom PC-word-delimiters "-_. "
"A string of characters treated as word delimiters for completion.
Some arcane rules:
If `]' is in this string, it must come first.
If `^' is in this string, it must not come first.
If `-' is in this string, it must come first or right after `]'.
In other words, if S is this string, then `[S]' must be a valid Emacs regular
expression (not containing character ranges like `a-z')."
:type 'string)