Character classes

Character classes
[...]A single character listed or contained within a listed range. Ranges can be combined with the {+} and {-} operators. For example [a-z]{+}[0-9] is the same as [0-9a-z] and [a-z]{-}[aeiou] is the same as [b-df-hj-np-tv-z].
[^...]A single character not listed and not contained within a listed range.
.Any character, default [^\n].
\dDigit character, [0-9].
\DNon-digit character, [^0-9].
\sWhite space character, [ \t\n\r\f\v].
\SNon-white space character, [^ \t\n\r\f\v].
\wWord character, [a-zA-Z0-9_].
\WNon-word character, [^a-zA-Z0-9_].

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