using !sort in windows commandline: passing special characters

I use cygwin on my windows system to use unix commands from vim commandline.

This is written in my text file:
Adam|12345
Bob|34567
Joe|56789
Sam|45678
Wendy|23456

When I use:

:%!sort -k2n -t'|'

it gives an error:
''' is not recognized as an internal or external command, operable program or batch file.

Same problem when I use '>' and '<' as separator.
Escaping doesn't resolve my problem.
I don't have problems with other separators as ';', ')', '\\', '=' and many others.

btw....
Is it possible to use regex in the sort command. No info is written in the manual and it doesn't work in my vim.

:%!sort -k3 -t'[,;]'

(sort after the 3rd time a ',' or ';' is found)

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