Stephen Berman <[EMAIL PROTECTED]> writes:
> There seems to be something about match-string that I don't
> understand. Here is an example of the kind of code I'm working with:
>
> (defvar mystring1 "+++++ ")
> (defvar mystring2 " ~~~~~")
> (defun mystring-list ()
> (interactive)
> (with-current-buffer (get-buffer-create "*test*")
> (switch-to-buffer "*test*")
> (dotimes (num 5)
> (insert mystring1 "test" (int-to-string (1+ num)) mystring2 "\n"))
> (goto-char (point-min))
> (let ((mystring-list ()))
> (while (re-search-forward
> (concat "^" (regexp-quote mystring1) "\\(.+\\)"
> (regexp-quote mystring2) "$")
> (point-max) t)
> (setq mystring-list (append (list (match-string 1)) mystring-list)))
> (insert "\n")
> (setq mystring-list (reverse mystring-list))
> (dolist (elt mystring-list)
> (insert elt " ")))))
>
> After evalling this code and typing `M-x mystring-list', buffer *test*
> consists of these lines:
>
> +++++ test1 ~~~~~
> +++++ test2 ~~~~~
> +++++ test3 ~~~~~
> +++++ test4 ~~~~~
> +++++ test5 ~~~~~
> test1 test2 test3 test4 test5
>
> The last line indicates that match-string correctly matches the
> strings that build mystring-list. But when I step through the code
> with edebug, match-string always returns nil and a wrong-type-argument
> error is raised at the insert (since nil is not char-or-string-p).
> (Edebug isn't the problem: evalling first the regexp search code in
> *test* and then (match-string 1) also returns nil.) Because of this
> I'm having a hard time debugging other code that uses match-string.
> Can someone explain what's going on?
>
> Steve Berman
>
>
>
I tried your example, with
GNU Emacs 21.2.2 (sparc-sun-solaris2.8, X toolkit) of 2005-02-10 on
gax
and also with
XEmacs 21.4 (patch 15) "Security Through Obscurity" [Lucid]
(sparc-sun-solaris2.8, Mule) of Fri Feb 11 2005 on gax
When I put a breakpoint in Edebug after
(match-string 1)
I get the strings I expect to see. Also, a breakpoint after 'elt' in
(insert elt " ")
behaves as I would expect & not as you describe.
--
Alan Wehmann
wehmann(removespam)@fnal.gov
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