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regex [64886f47]

regex101.com/
can also use -r or -E in sed

1. PCRE

2. Oniguruma Regex

docs: github.com/kkos/oniguruma/blob/master/doc/RE
library for regex that has features from many different regular regexes
jq has some additional docs at github.com/stedolan/jq/wiki/Docs-for-Oniguruma-Regular-Expressions-(RE.txt)