URL_DECODE

Converts a string that was encoded for use in a URL (see URL_ENCODE) back to normal text

URL_DECODE (text)

Cannot be used in the condition of a FIND action.

Attribute of the Plain Text type or string constant or calculation producing text

Text: the URL-decoded form of the text.

Object.Text = URL_DECODE (Object.EncodedText) 

For example, URL_DECODE ('John%20Smith') returns 'John Smith'.