Q: How do I assign a numeric regular expression to a PDF form field?
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A: You would need to associate a JavaScript action to a Widget.
As a starting point you may want to take a look at Acrobat JavaScript
Reference (http://www.adobe.com/devnet/acrobat/javascript.html).
For example, the following JavaScript string
AFNumber_Format(6, 1, 1, 0, "\u0024", true);
sets the field format to a decimal number with 6 decimal places, no
separator, and dollar ($) as a currency symbol. Please see Acrobat
JavaScript Reference Manual for detailed documentation on other
formatting commands.
For examples of how to embed JavaScript using PDFNet SDK (http://
www.pdftron.com/pdfnet) you may want to search this forum or KB
articles.