If you are just looking for an elegant, ready-made solution then Scalar::Util::looks_like_number fits the bill:
use strict;
use warnings;
use Scalar::Util 'looks_like_number';
use Test::More;
my @nums = (
'1.5671',
'777',
'0',
'-4.567',
'+9.987'
);
my @not = (
'0777 891 777',
'121A3D',
'+9.8.97',
'+9.8¬97',
'9.8[97'
);
plan tests => @nums + @not;
for my $i (@nums) {
ok looks_like_number ($i), "$i is a number";
}
for my $i (@not) {
ok ! looks_like_number ($i), "$i is not a number";
}
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