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A comment on Emacs: The most successful malleable system. Parent comment
Parentheses are also not metachars in Vi (and Vim) regexps by default, and are not metachars in POSIX BRE (basic regular expressions).
https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1...
The grep utility, for instance, understands BREs by default; you must use grep -E to get ERE (extended regex) in which ( and ) are grouping characters, or else the deprecated egrep command (not in POSIX).
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Parentheses are also not metachars in Vi (and Vim) regexps by default, and are not metachars in POSIX BRE (basic regular expressions).
https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1...
The grep utility, for instance, understands BREs by default; you must use grep -E to get ERE (extended regex) in which ( and ) are grouping characters, or else the deprecated egrep command (not in POSIX).