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please use code tags from now..
can you see the extra tabs in your data?

Removing tabs with a pipe should give you unique list

cut -d'|' -f4 emp.1st | sed 's/\t//g' | sort -u

No, it matches 2 or 3 of "any character". It'd match AB, QRZ, --, or anything that's two or three characters long.

So basically, this regex means "the third or fourth character must be a w".

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It will look for exactly 10 digits in a row.

These exact 10 digits can appear anywhere in the line.

It will find 8 digits inside 10 digits, the same way it will find 'gas' inside 'gasoline'.
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