`x{a,b}y' expands to `xay:xby'. For example:
foo/{1,2}/baz
expands to `foo1baz:foo2baz'. `:' is the path separator on the current system; e.g., on a DOS system, it's `;'.
Braces can be nested; for example, `x{a,b{1,2}}y' expands to `xay:xb1y:xb2y'.
This feature can be used to implement multiple TeX hierarchies, by
assigning a brace list to $TEXMF, as mentioned in
`texmf.cnf.in'.
Brace expansion is implemented in the source file `kpathsea/expand.c'. It is taken from Bash, and is thus covered by the GNU General Public License, rather than the Library General Public License that covers the rest of Kpathsea.
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