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(zsh.info)Brace Expansion

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Brace Expansion
===============

A string of the form `FOO{XX,YY,ZZ}BAR' is expanded to the individual
words `FOOXXBAR', `FOOYYBAR' and `FOOZZBAR'.  Left-to-right order is
preserved.  This construct may be nested.  Commas may be quoted in
order to include them literally in a word.

An expression of the form `{N1..N2}', where N1 and N2 are integers, is
expanded to every number between N1 and N2 inclusive.  If either number
begins with a zero, all the resulting numbers will be padded with
leading zeroes to that minimum width.  If the numbers are in decreasing
order the resulting sequence will also be in decreasing order.

If a brace expression matches none of the above forms, it is left
unchanged, unless the BRACE_CCL option is set.  In that case, it is
expanded to a sorted list of the individual characters between the
braces, in the manner of a search set.  `-' is treated specially as in
a search set, but `^' or `!' as the first character is treated normally.

Note that brace expansion is not part of filename generation
(globbing); an expression such as */{foo,bar} is split into two
separate words */foo and */bar before filename generation takes place.
In particular, note that this is liable to produce a `no match' error if
_either_ of the two expressions does not match; this is to be contrasted
with */(foo|bar), which is treated as a single pattern but otherwise
has similar effects.