Exporting Users by display name with Apostrophe

Question

Looking to read in a list of users by display name, grab additional properties, format and export to a new list.
This issue I have is users with apostrophe's in their display name do not get parsed properly.  I'm not sure how to leverage the ` in this case to escape that character
Thanks,
# Import AD Module
Import-Module ActiveDirectory
# Import CSV into variable $users
$users = Import-Csv -Path C:\Input.csv
# Loop through CSV and update users if they exist in CVS file
foreach ($user in $users) {
#Search in specified OU and Update existing attributes
Get-ADUser -Filter "DisplayName -eq '$($user.DisplayName)'" -searchscope Subtree -Properties "UserPrincipalName", "EmailAddress", "Department","msRTCSIP-PrimaryUserAddress" | Select-Object SamAccountName, UserPrinciPalName,
EmailAddress, Department, @{ n = 'msRTCSIP-PrimaryUserAddress'; e = { $_.'msRTCSIP-PrimaryUserAddress' -replace "sip:", ""  } } | export-csv 'c:\output.csv' -NoClobber -Append

Answer 1

What I mean with this is, if I have a an input of file of AD users by display name and one of those contains an apostrophe, for example Joe S'mith.
The ' in the name does not get parsed properly and I wind up getting output similar to the following.
Get-ADUser : Error parsing query: 'DisplayName -eq 'Joe S'Mith'' Error Message: 'syntax error' at position: '25'.
At line:20 char:1
+ Get-ADUser -Filter "DisplayName -eq '$($user.DisplayName)'" -searchscope Subtree ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : ParserError: (:) [Get-ADUser], ADFilterParsingException
    + FullyQualifiedErrorId : Error parsing query: 'DisplayName -eq 'Joe S'Mith'' Error Message: 'syntax error' at position: '25'.,Microsoft.ActiveDirectory.Management. 
   Commands.GetADUser