From 498535fbfc46cdf47f6874ca69237b639e6daaa0 Mon Sep 17 00:00:00 2001 From: Juanma Barranquero Date: Fri, 30 May 2003 23:11:35 +0000 Subject: [PATCH] (looking-back): New function to check for regular expression before point. --- lisp/subr.el | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/lisp/subr.el b/lisp/subr.el index c03b2ff0a98..2ca79e54b76 100644 --- a/lisp/subr.el +++ b/lisp/subr.el @@ -1820,6 +1820,19 @@ STRING should be given if the last search was by `string-match' on STRING." (buffer-substring-no-properties (match-beginning num) (match-end num))))) +(defun looking-back (regexp) + "Return t if text before point matches regular expression REGEXP. +This function modifies the match data that `match-beginning', +`match-end' and `match-data' access; save and restore the match +data if you want to preserve them." + (save-excursion + (let ((beg (point))) + (if (re-search-backward regexp nil t) + (if (= (match-end 0) beg) + t + nil) + nil)))) + (defconst split-string-default-separators "[ \f\t\n\r\v]+" "The default value of separators for `split-string'. -- 2.39.5