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Sure @rajputakansha, it's looking for cells that contain 4 digits followed by a hyphen, followed by between 1 and 2 digits, followed by a hyphen, followed by between 1 and 2 digits. The rows that match this are then coming out of the true anchor of the filter tool, and those that do not fulfill that condition are coming out of the false anchor.
I haven't changed the data type at all, it may be worthwhile doing it after the filter tool however. The filter tool is simply checking whether each row fits the condition i mentioned previously, 4 digits, hyphen, 1 or 2 digits, hyphen, 1 or two digits.
@rajputakansha the reason I did not go down the same route as @fmvizcaino is because changing the data type would remove the (non date) rows from the data stream. Using a filter against a regex_match would still keep these "non date" rows available to be used later in the workflow if so desired.