Modify Username on Input?

[Kozlek, Vincent]

Rather than bothering with changing the input, you could allow both formats through LDAP by using something similar to this as the LDAP userFilter:
(|(sAMAccountName={user})(userPrincipalName={user}))

This assumes you have both format values in your directory.  The above can be used for Active Directory and would work with the LDAP authenticator.

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