powershell exchange 2007 character question

In our organization we use special characters in the display name to differentiate a shared mailbox, versus user mailboxes, versus distribution list.What I am trying to do is find user mailboxes which are incorrectly created with the wrong character.

Get-User -ResultSize Unlimited | Where {$_.RecipientType -eq "UserMailbox" -and $_.Displayname -contains '^' -and $_.Displayname -contains '|' -and $_.Displayname -contains '@'}

I was hoping to shorten this and trying to group the special characters together.
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Bryan ButlerCommented:
Shortening as in speed?  Have you tried piping each result as in:

Get-User -ResultSize Unlimited | Where {$_.RecipientType -eq "UserMailbox"} | Where ($_.Displayname -contains '^') | Where ($_.Displayname -contains '|') | Where ($_.Displayname -contains '@')}

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