Normally, dynamic abbrev expansion ignores case when searching for expansions. That is, the expansion need not agree in case with the word you are expanding.
This feature is controlled by the variable
dabbrev-case-fold-search. If it is
t, case is ignored in
this search; if
nil, the word and the expansion must match in
case. If the value of
case-fold-search, which is true by default, then the variable
case-fold-search controls whether to ignore case while searching
Normally, dynamic abbrev expansion preserves the case pattern of the abbrev you have typed, by converting the expansion to that case pattern.
dabbrev-case-replace controls whether to preserve
the case pattern of the abbrev. If it is
t, the abbrev's case
pattern is preserved in most cases; if
nil, the expansion is
always copied verbatim. If the value of
case-replace, which is true by default, then the variable
case-replace controls whether to copy the expansion verbatim.
However, if the expansion contains a complex mixed case pattern, and
the abbrev matches this pattern as far as it goes, then the expansion is
always copied verbatim, regardless of those variables. Thus, for
example, if the buffer contains
you type v a M-/, it copies the expansion verbatim including its
dabbrev-abbrev-char-regexp, if non-
controls which characters are considered part of a word, for dynamic expansion
purposes. The regular expression must match just one character, never
two or more. The same regular expression also determines which
characters are part of an expansion. The value
nil has a special
meaning: abbreviations are made of word characters, but expansions are
made of word and symbol characters.
In shell scripts and makefiles, a variable name is sometimes prefixed
with `$' and sometimes not. Major modes for this kind of text can
customize dynamic abbreviation to handle optional prefixes by setting
dabbrev-abbrev-skip-leading-regexp. Its value
should be a regular expression that matches the optional prefix that
dynamic abbreviation should ignore.
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