A component of the item:
CLASS | Description |
|---|---|
| c | matches character c |
| c-d | matches characters in the range c through d |
. | matches any character 34 |
%a / %A | matches any / not letter |
%c / %C | matches any / not control character |
%d / %D | matches any / not digit |
%g / %G | matches any / not printable character but space |
%l / %L | matches any / not lowercase letter |
%p / %P | matches any / not punctuation character |
%s / %S | matches any / not whitespace character |
%u / %U | matches any / not uppercase letter |
%w / %W | matches any / not alphanumeric character |
%x / %X | matches any / not hexadecimal digit |
[xxx] / [^xxx] | matches the union / complement of class(es) xxx |
%xxx | escapes xxx magic character ^$()%.[]*+-? |