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enclosed in B<[:> and B<:]> and represents the set of characters
as defined in ctype(3).

If the first character after B<[> is B<^>, the sense of matching is
inverted.

To include a literal 'C<^>', place it anywhere else but first. To
include a literal 'C<]>' place it first or immediately after an
initial B<^>. To include a literal 'C<->' make it the first (or
second after B<^>) or last character, or the second endpoint of
a range.

The special bracket expression constructs C<[[:E<lt>:]]> and C<[[:E<gt>:]]>
match the null string at the beginning and end of a word respectively.
(Note that neither is identical to Perl's '\b' atom.)

=head2 Additional Atoms

Since some sed implementations provide additional regular expression
atoms (not defined in POSIX 1003.2), B<psed> is capable of translating