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3466 is it a number is you should see perldoc -q 'is a number', where you will learn in part that /^\d+$/ is the proper, reliable test for a whole number or zero... /^([+-]?)(?=\d|\.\d)\d*(\.\d*)?([Ee]([+-]?\d+))?$/ for floating point and scientific notation... see also Scalar::Util::looks_like_number, Data::Types, Regexp::Common or POSIX::strtod perlbot <*:##NULL>