An alternative to grep which uses JavaScript's Regex, supports a match and a match-and-replace
npm i jsgrep-cli -g
Match input from stdin, return any matching line:
ls -al ~ | jsgrep " \.[a-z]+rc$"
Match and replace lines from stdin. Capturing groups are exposed as $1, $2... variables (1-indexed), and must probably be escaped to prevent being interpreted by your shell:
ls -al ~ | jsgrep ".+ (\.[a-z]+rc$)" "\$1"
Passing flags (default i):
ls -al ~ | jsgrep " \.[a-z]+rc$" --flags iu