Shorthands

\d Diget [0-9]

\D Non Diget [^0-9]

\w Word character (usually) [_a-zA-Z0-9]

\W Non Word character (usually) [^_a-zA-Z0-9]

\s Whitespace [•\f\n\r\t\v]

\S Non Whitespace [^•\f\n\r\t\v]