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Re: Suggestion: check for \n, \t in regexp for query-replace-regexp


From: William F. Hammond
Subject: Re: Suggestion: check for \n, \t in regexp for query-replace-regexp
Date: 02 Dec 2001 12:05:10 -0500
User-agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.1

address@hidden (David Kastrup) writes:

> >>>>> "Richard" == Richard Stallman <address@hidden> writes:
> 
>  Richard> I made it warn about such input but not reject it.
>  Richard> After all, you might want to replace a backslash and an n.
> 
> In which case you were supposed to say \\n, not \n.

In historic regexps "\n" matches "n", not a newline.  That must be
related to why isearch-forward-regexp is the way it is.

Since the C-q C-j thing works with isearch-forward-regexp regardless
of underlying system newline conventions, I see no objection to it.
But _if_ I find such use of C-j abrasive, then, while interactive, I
may use, for example,

    M-q   (re-search-forward "\nDate: " nil t)

while remembering for this context that '\' needs to be doubled to
produce a single '\' in the search-string argument.

                                    -- Bill




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