Generalise file, include local libraries

Rename-PDFByContent.ps1

+Unblock-File -Path .\lib\iTextSharp.dll
+Add-Type -Path .\lib\itextsharp.dll
+
 function Get-UIDFromPdf
 {
     [CmdletBinding()]
     param (
         [Parameter(Mandatory = $true)]
         [string]
-        $Path
+        $Path,
+        [Parameter(Mandatory = $true)]
+        [string]
+        $SearchString
     )
 
     $Path = $PSCmdlet.GetUnresolvedProviderPathFromPSPath($Path)
 
     $reader = New-Object iTextSharp.text.pdf.pdfreader -ArgumentList $Path
 
-    $lines = [iTextSharp.text.pdf.parser.PdfTextExtractor]::GetTextFromPage($reader, 1) -split "\r?\n"
+    $lines = [iTextSharp.text.pdf.parser.PdfTextExtractor]::GetTextFromPage($reader, 1) -split "\r\n"
 
-    $output = ($lines | Where-Object { $_ -like 'CC Student Id:*' }).Replace('CC Student Id:','').Trim()
+    $output = ($lines | Where-Object { $_ -like ('*' + $SearchString + '*') }).Trim()
 
     $reader.Close()
 
     return $output
 }
 
-Unblock-File -Path C:\Scripts\itextsharp\iTextSharp.dll
-Add-Type -Path C:\Scripts\itextsharp\itextsharp.dll
+
 
 $files = Get-ChildItem -Filter '*.pdf' -File
 
 $files | ForEach-Object {
 
-    $uid = Get-UIDFromPdf -Path $_.FullName
+    $uid = Get-UIDFromPdf -Path $_.FullName -SearchString 'Student Id:'
+    $newname = $uid.Replace('Student Id:','').Trim()
 
     if($uid.Length -eq 7){
 
-        $_ | Rename-Item -NewName "$uid.pdf"
+        $_ | Rename-Item -NewName "$newname.pdf"
 
     }