I am [ completely new to PowerShell and ] concatenating a string in a loop, if a special condition occurs I should insert a line break...how can I do this?

Basically looking for the equivalent of \n .

$str = ""
foreach($line in $file){
  if($line -Match $review){ #Special condition
    $str += ANSWER #looking for ANSWER
  #code.....
So far I have tried 
"\n" '\n' "\N" '\N' "\r" '\r' "\R" '\R' '`n' '`r' '-n' '-r' 
Try "`n" with double quotes. (not single quotes '`n' )
For a complete list of escaping characters see:
Help about_Escape_character
The code should be
$str += "`n"
                Thanks but doesn't work. it  gives me The term ' ' is not recognized as the name of a cmdlet, function, sc....
                    – user454322
                Aug 9 '12 at 4:52
                The examples in Help about_Escape_character helped me to figure out the problem. Editing answer to show the solution
                    – user454322
                Aug 9 '12 at 4:56
foreach($line in $file){
  if($line -Match $review){ #Special condition
    $str += Write-Host ""
    $str += ANSWER #looking for ANSWER
  #code.....
        
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