Variable: read-regexp-defaults-function

read-regexp-defaults-function is a customizable variable defined in replace.el.gz.

Value

nil

Documentation

Function that provides default regexp(s) for read-regexp.

This function should take no arguments and return one of: nil, a regexp, or a list of regexps. Interactively, read-regexp uses the return value of this function for its DEFAULT argument.

As an example, set this variable to find-tag-default-as-regexp to default to the symbol at point.

To provide different default regexps for different commands, the function that you set this to can check this-command.

This variable was added, or its default value changed, in Emacs 24.4.

Probably introduced at or before Emacs version 24.4.

Source Code

;; Defined in /usr/src/emacs/lisp/replace.el.gz
(defcustom read-regexp-defaults-function nil
  "Function that provides default regexp(s) for `read-regexp'.
This function should take no arguments and return one of: nil, a
regexp, or a list of regexps.  Interactively, `read-regexp' uses
the return value of this function for its DEFAULT argument.

As an example, set this variable to `find-tag-default-as-regexp'
to default to the symbol at point.

To provide different default regexps for different commands,
the function that you set this to can check `this-command'."
  :type '(choice
	  (const :tag "No default regexp reading function" nil)
	  (const :tag "Latest regexp history" regexp-history-last)
	  (function-item :tag "Tag at point"
			 find-tag-default)
	  (function-item :tag "Tag at point as regexp"
			 find-tag-default-as-regexp)
	  (function-item :tag "Tag at point as symbol regexp"
			 find-tag-default-as-symbol-regexp)
	  (function :tag "Your choice of function"))
  :group 'matching
  :version "24.4")