problem with regex

[abcd]

I have a regex: '[A-Za-z]:\\([^/:\*\?"<>\|])*'

when I do, re.compile('[A-Za-z]:\\([^/:\*\?"<>\|])*') ...I get

sre_constants.error: unbalanced parenthesis

do i need to escape something else?  i see that i have matching
parenthesis.

thx

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