Here’s a PowerShell function to find non-base64 characters in a block of text.
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Function Find-NonBase64Chars { Param( [Parameter(Mandatory=$True)]$Text ) $InvalidCharacters = @() $x=0 ForEach ($Line in $Text) { $x++ if ( $Line -notmatch "^[A-Za-z0-9\=\+\/\s\n]+$" ){ For ($y=0;$y -lt $($Line.Length - 1); $y++) { $Character = $Line[$y] If ($Line[$y] -notmatch "^[A-Za-z0-9\=\+\/\s\n]+$"){ If ($InvalidCharacters -notcontains $Character) { $InvalidCharacters += $Character } # Write-Output "Invalid Character: Line $x Index $y Character $Character" } } } } "Invalid Characters:`n$InvalidCharacters" } |
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