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Cheat sheet
\d \w \sdigit · word · whitespace\D \W \Snegated classes[abc] [^abc]set · negated set[a-z]range. *any · zero or more+ ?one or more · optional{n} {n,m}exact · range count^ $start · end of input/line\b \Bword boundary(abc)capture group(?:abc)non-capturing(?<name>abc)named capturea|balternation(?=abc)lookahead(?!abc)negative lookahead(?<=abc)lookbehind