ELisp: Trim String

Emacs 24.4 New String Functions

Emacs 24.4 added many string functions. [see Emacs 24.4 (Released 2014-10)]

These are new string functions:

• string-blank-p
• string-empty-p
• string-join
• string-reverse
• string-trim-left
• string-trim-right
• string-trim
• string-remove-prefix
• string-remove-suffix

To use them, you need to first (require 'subr-x).

(require 'subr-x)
(string-trim " something  ") ; ⇒ "something"

Note: these functions are not documented and are kinda experimental. In the file header, it says it shouldn't be documented.

;; Do not document these functions in the lispref.
;; http://lists.gnu.org/archive/html/emacs-devel/2014-01/msg01006.html

See also: Emacs Lisp Problems: Trim String, Regex Match Data, Lacking Namespace