>Can someone explain that "a..gr" thing to me please?
Same as 1..200, really ;)
Basically you just use letters instead of numbers.
a..z yields the 26 characters of the alphabet,
a..az yields those and another 26 prefixed with a
a..bz yields those and another 26 prefixed with b
and so on. Same system, more "numbers" ...
Incidentally a..gr yields 7*26 + 18 "numbers".
update :
as crazyinsomniac pointed out, the range-operator is discussed in more detail in perlman:perlop.
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