Formatting Numeric Only with Variable Decimal Places

Acrobat Pro 9, Windows XP
I'm creating a form that has a number of text box form fields that are to be numeric only per the form requestor. However, for any given field of this type the number of decimal places that can be entered can vary from 0-3 and the requestor does NOT want any unnecessary decimals to appear in the final output (e.g., a "1.2" entry should not appear as "1.200"). The standard number formatting properties always show all the decimal places so I know it's not that route. No calculations will be performed with any of these entries -- the form requestor merely is entering data and then printing it out so that it's legible for the end-user.
I know that the following line of JavaScript in the Custom Keystroke property limits the entry to numeric only, but how should I tweak the syntax to allow a decimal entry:
event.rc = (!event.change || /^\d$/.test(event.change))
I probably also need a script to format for decimal places, but I don't know where to look in the JavaScript for Acrobat API Reference or in the MDN JavaScript Reference.
Thanks in advance for any assistance.

Good question. To keep it simple (because there are about 300 form fields in this document), if they choose to add extra decimal zeros, then who am I to argue with their entry. So in your example for a given form field, if they enter "1.200" then I expect that they want "1.200" to display.
OK, but earlier you said:
"However, for any given field of this type the number of decimal places that can be entered can vary from 0-3 and the requestor does NOT want any unnecessary decimals to appear in the final output (e.g., a "1.2" entry should not appear as "1.200")."
This seems inconsistent. Can you clarify? The point is the code and where it's placed depends on this. It could be implemented either as a custom Validate or Format script, in addition to a Keystroke script.

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