Receiving data from a form that contains a comma

Is there a way to receive data with a comma and have it remain a comma.

Here is the data that was inputed:
pink, bunny

and here's the data that was printed after going through a parsing form:
pink%2C bunny

Is there any type of code that I can use to fix this problem?
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$value = "pink %2C bunny";
$value =~ s/%2C/,/;

It might be better to handle all cases look though like this:

while (/\%(..)/)
    $char = chr(hex($1));

or something like it.

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