re2

Fast regular expression library supporting PCRE-style patterns

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Alternative to backtracking PCRE-style regular expression engines

re2

Test if a string matches a regular expression pattern$ echo 'hello world' | re2 'h.*d'

Extract matching groups from text using capture groups$ echo 'user@example.com' | re2 '([a-z]+)@([a-z.]+)'

Perform case-insensitive pattern matching$ echo 'HELLO' | re2 '(?i)hello'