"Return t if there are no upper case chars in STRING.
If REGEXP-FLAG is non-nil, disregard letters preceded by `\\' (but not `\\\\')
since they have special meaning in a regexp."
- (let ((case-fold-search nil))
- (not (string-match (if regexp-flag "\\(^\\|\\\\\\\\\\|[^\\]\\)[A-Z]"
- "[A-Z]")
- string))))
-
+ (let (quote-flag (i 0) (len (length string)) found)
+ (while (and (not found) (< i len))
+ (let ((char (aref string i)))
+ (if (and regexp-flag (eq char ?\\))
+ (setq quote-flag (not quote-flag))
+ (if (and (not quote-flag) (not (eq char (downcase char))))
+ (setq found t))))
+ (setq i (1+ i)))
+ (not found)))
;; Portability functions to support various Emacs versions.