Using the function RegExp. The first parameter is the field you want to check and the second is for the regular expression you want to check against. There are some already built expressions in the constants tab, like for instance the email address. So if you drag the regexp function to a condition, place an input field as the first parameter and drag the constant email address to the second parameter the condition will be true when the text in that input field match the email address pattern.
Thanks Victor that worked
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