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All the Validation Patterns are XML schema regular expressions (regex) created. you can use an a tool like regex101 to create your own patterns or use any of the following.
The following examples were found on frevvo's documetation site linked at the top of this page.
US Zip Code Pattern
A pattern that restricts a text control to only allow strings formatted as a US zip code: ##### or #####-####:
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| Code Block |
|---|
\d{3}-\d{2}-\d{4} |
Numbers with commas
Live Forms' default The default number control supports digits followed by an optional decimal point and multiple decimal places. Suppose instead you want to allow numbers containing commas and optionally starting with a '$' and only up to 2 decimal places. For example: $1,000.50 2,500. But also to allow numbers without the comma such as $1000. To do this:
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