Or... I suppose if we have a digit either size of a '.' then it's probably a number with a decimal point: 
$s = "123.45";
$s =~ s/(?<=\d)\.(?=\d)/,/;

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ALthough... I don't quite understand what you're trying to do - surely if you're parsing a CSV file containing numbers with decimal points you'd rather they weren't commas?

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

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