How to Check if a String is Empty

To identify is a string is empty use the following construct:

Pass a string value into a "Regex Extract" app that check for the regex .+ (which will match any string that has at least one character).

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Then, join the string array output from the regex app (this converts the string array to a string). Then run it through an "If" operator that checks if the string is not equal to null.

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This works because the "Regex Extract" app will return null if there was no match for the regex (in this case, .+ which means the string is empty).