If you’re into programming highlighting the matching parentheses in
your code is probably something you find rather desirable. Emacs
doesn’t do so by default, but the global minor mode
that comes bundled with Emacs, does.
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Valid styles are
parenthesis (meaning highlight the matching
expression (meaning show the entire expression
enclosed by the parentheses) and
mixed (meaning show the matching
parentheses if both are visible, and the expression otherwise).
Personally I find
parenthesis as the least distracting option and
therefore I favor it.
If you’d like to change the faces used for matching and mismatched
parentheses you’d have to alter
show-paren-match. Most decent color themes do this out the box.
show-paren-mode is enabled out-of-the-box in