Perl

  https://perldoc.perl.org/perlre.html

PCRE

  http://www.pcre.org/current/doc/html/pcre2syntax.html

POSIX BRE/ERE

  http://pubs.opengroup.org/onlinepubs/9699919799/

GNU BRE/ERE

  https://www.gnu.org/software/sed/manual/sed.html#Regular-Expressions-Overview

References:

http://www.regular-expressions.info/refrepeat.html

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