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Description: https://rol.redhat.com/rol/roc/course/ch02s07.html

The table has the following entry:
[!abc...] Any one character not in the enclosed class.
Prior to this class, we used the ^ within square brackets to negate, such as [^abc...]. Is it worth showing that as well?

When we cover curly brace expansion on this page, we might make a note of using

or

. This syntax gets used on page https://rol.redhat.com/rol/roc/course/ch02s09.html.