Brace expansion is not specific to pathname matching. I've shown you: type 

echo a{1..3}

[download]
you get 
a1 a2 a3

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even if such files do not exist. 
echo > a1; ls a{1..3}

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prints 
ls: a2: No such file or directory
ls: a3: No such file or directory
a1

[download]

There is a filename matching feature too, in bash it looks like this: 

shopt -s extglob 
echo a@(1|2|3)

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is really similar to the friendly echo a[1-3], it prints 
a1

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if a1 exists but the other files don't. (Don't ask me how it works in zsh.) There is no numeric range variant of this though.

In reply to Re^3: String expansion script by ambrus
in thread String expansion script by blazar

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