Powershell - Find and Replace then Save

Question

I need to read 10K+ files, search the files line by line, for the string of characters after the word SUFFIX. Once I capture that string I need to remove all traces of it from the file then re-save the file.
With the example below - I would capture -4541. Then I would replace all occurrences of -4541 with NULL. Once I replace all the occurrences I then save the changes.

Here is my Data:

ABSDOMN                                  VER     1 D  SUFFIX -4541

         05 ST-CTY-CDE-FMHA-4541
          10 ST-CDE-FMHA-4541                        9(2)
          10 CTY-CDE-FMHA-4541                       9(3)
         05 NME-CTY-4541                             X(20)
         05 LST-UPDTE-DTE-4541                       9(06)
         05 FILLER                                   X

Here is a starting script. I can Display the line that has the word SUFFIX but I cannot capture the string after it. In this case -4541.

$CBLFileList = Get-ChildItem -Path "C:\IDMS" -File -Recurse 
$regex = "\bSUFFIX\b" 
$treat = $false 
ForEach($CBLFile in $CBLFileList) {
    Write-Host "Processing .... $CBLFile" -foregroundcolor green      
    Get-content -Path $CBLFile.FullName |
    ForEach-Object {
            if ($_ -match $regex) {
                Write-Host "Found Match - $_" -foregroundcolor green
                $treat=$true
        }    
    }