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From: bard@THEORY.LCS.MIT.EDU.UUCP
Newsgroups: comp.emacs
Subject: isearch behavior
Message-ID: <8703302059.AA08414@RAVEN.LCS.MIT.EDU>
Date: Mon, 30-Mar-87 15:59:01 EST
Article-I.D.: RAVEN.8703302059.AA08414
Posted: Mon Mar 30 15:59:01 1987
Date-Received: Wed, 1-Apr-87 02:06:42 EST
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  One of the few cute tricks that I have found in other editors that is
missing from (gnu) emacs is semi-case-sensitive searching, in which lowercase
letters match the corresponding uppercase letters, but uppercase letters do
not match lowercase ones.   This seems like a better default choice than
either case-fold-search = nil (which tends to miss words at the beginnings of
sentences, or variable names with variant capitalization), or non-nil (which
tends to get too many matches).  
  Does anyone understand the C code of "looking-at" well enough to tell me
how to add it?

Thanks,
  Bard Bloom
(Disclaimer: My employer has, to the best of my knowledge, never thought
about this style of searching and probably won't unless I mention it to him.)