OK, to match those possible characters (and only those) try something like m/((?:\w|\\\&|\-)*)\.((?:\w|\\\&|\-)*)/
the \w takes care of letters, numbers and _. I always escape the - out of habit but is unnecessary. The /i is redundant since the \w is case insensitive. Personally I would do a nongreedy match. It will match other characters but it probably won't matter. Something like: m/(.*?)\.(.*)/
update --
of course a simple split would do the trick.
my ($client, $project, $subproject) = split /\./, $x;
-- flounder
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