Filtering out results from multiple objects in powershell?

Is there a way to run a regular expression for multiple objects, so multiple objects and their output filter out the results
without having to perform an Out-String first?  I was wanting to run a regex with numerous users and groups, and their standard file system rights by default and
then query against any non standard perms for various directories.  However I have found that it appears to be a little bit more difficult, but can export out to a
string value, however, I'll be grabbing those results (hopefully after the filter) and exporting to CSV, so would be much easier/cleaner to filter out right after
the Select-Object statement, does anyone have any suggestions to do that?
So example:
Example:
Get-Item "C:\temp" | Get-Acl | % {$_.Access} | Select-Object IdentityReference,FileSystemRights | ? {$_ -notmatch "Administrators"}
IdentityReference                                                                                      FileSystemRights
-----------------                                                                                      ----------------
NT AUTHORITY\SYSTEM                                                                                         FullControl
BUILTIN\Administrators                                                                                      FullControl
BUILTIN\Users                                                                               ReadAndExecute, Synchronize
BUILTIN\Users                                                                                                AppendData
BUILTIN\Users                                                                                               CreateFiles
CREATOR OWNER                                                                                                 268435456

But regex would be great to get the values like "Administrators\S*\s*FullControl" that would filter out both IdentityReference and FileSystemRights based on the regex.

I'm not sure that I understand. The -match and -notmatch operators support regular expressions.
 
Get-Help About_comparison_operators

Yes, but when you output the select-objects such as above with IdentityReference and FileSystemRights, each object is seperate so a regex doesn't query both values without exporting to a string value etc.

So for example:
Get-Item "C:\temp" | Get-Acl | % {$_.Access} | Select-Object IdentityReference,FileSystemRights | ? {$_.IdentityReference  -Notmatch "Administrators\S*\s*FullControl"}
IdentityReference                                                                                      FileSystemRights
-----------------                                                                                      ----------------
NT AUTHORITY\SYSTEM                                                                                         FullControl
BUILTIN\Administrators                                                                                      FullControl
BUILTIN\Users                                                                               ReadAndExecute, Synchronize
BUILTIN\Users                                                                                                AppendData
BUILTIN\Users                                                                                               CreateFiles
* doens't catch FullControl
 
Get-Item "C:\temp" | Get-Acl | % {$_.Access} | Select-Object IdentityReference,FileSystemRights | ? {$_.IdentityReference  -Notmatch "Administrators"}
*filters out administrators, but not based on FileSystemRights, only on IdentityReference.
IdentityReference                                                                                      FileSystemRights
-----------------                                                                                      ----------------
NT AUTHORITY\SYSTEM                                                                                         FullControl
BUILTIN\Users                                                                               ReadAndExecute, Synchronize
BUILTIN\Users                                                                                                AppendData
BUILTIN\Users                                                                                               CreateFiles

Thanks for the help found the answer.

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