use Scalar::Util qw( looks_like_number );

my $s = 123.45;
$s =~ s/\./,/ if looks_like_number($s);

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Works even better than setlocale because you are surely starting with the number in string form if you don't know whether a column contains a number or not.

In reply to Re^3: Change decimal point temporarily by ikegami
in thread Change decimal point temporarily by lima1

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