From Scalar::Util:: looks_like_number
perldoc -m Scalar::Util::PP
sub looks_like_number {
local $_ = shift;
# checks from perlfaq4
return 0 if !defined($_);
if (ref($_)) {
require overload;
return overload::Overloaded($_) ? defined(0 + $_) : 0;
}
return 1 if (/^[+-]?[0-9]+$/); # is a +/- integer
return 1 if (/^([+-]?)(?=[0-9]|\.[0-9])[0-9]*(\.[0-9]*)?([Ee]([+-]?[
+0-9]+))?$/); # a C float
return 1 if ($] >= 5.008 and /^(Inf(inity)?|NaN)$/i) or ($] >= 5.006
+001 and /^Inf$/i);
0;
}
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