You can create a text question to check the way a respondent answers and validate based on how they respond. One place you can learn more about regex is here:
As an example, if you want to validate that a respondent only answers with a number value that has 2 decimal places you can do something like this:
<text label="q39" optional="0" size="25">
<title>Regex with 2 decimal places test</title>
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