I need to add a (missing) single space after each punctuation sign in a string, but only if it is not a dot or comma inside a number. For example, "1,2,a,b" should be changed to "1,2, a, b". Also if there is already a space after punctuation sign, it should not be duplicated.
Right now I have this simple one for comma replacement:
$s =~ s/,(\S)/, $1/g;
But it spoils my numbers. Can you help? Is there a way to do it with one regular expression?
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