JRX: real-time JavaScript RegExp evaluator v1.1b3

\d     any decimal digit
\D     any char that is not a decimal digit
\s     any whitespace char
\S     any char that is not a whitespace
\w     any word char
\W     any non-word char
\b     word boundary; backspace inside []
\B     not a word boundary
\A     start of subject
       (independent of multiline mode)
\Z     end of subject or newline at end
       (independent of multiline mode)
\z     end of subject
       (independent of multiline mode)

[]     char class
^      beginning of line; negate inside []
$      end of line
()     capturing parentheses
|      alternation

*      zero or more time, equals to {0,}
+      one or more time, equals to {1,}
?      zero or one time, equals to {0,1}
{m,n}  preceding group: min m, max n times
(?:)   non-capturing parentheses
(?=x)  lookahead (only if followed by x)
(?!x)  negated lookahead (only if not followed)
\f     form-feed
\t     tab
\v     vertical-tab
\r     carriage return
\n     new line (unix:\n, win:\r\n, mac:\r)

\xhh   hexadecimal code of char (2 hex)
\uhhhh unicode code of char (4 hex)