Struggling substringing within an Array Pattern

Hi, I have some clunky code and I'm sure it can be better. Looking for suggestions. I search a file and to file lines before a search pattern. Sample log file.

Date Line 1 - Blah Blah Blah Dynamic Text

Date Line 2 - foo bar 2

Date Line 3 - foo bar 3

Date Line 4 - foo bar 4

In the example below, $searchPattern = "foo bar 4". What I want to find is all occurrences of "Blah Blah Blah" and capture the Dynamic Text and only get a result set that is distinct (I don't want the same Dynamic Text duplicated). the Code below sort of works, I'm stuck trying to substring out just want I need. Thought I could do something like this: select PATINDEX('Blah\sBlah\sBlah.*', $newStringArray), but the interpreter does not like it, even tried moving it to a string.

Any suggestions? 

Thank you!

foreach ($element in $drives) {
    write-host "Searching $element\$FileName" 
     $foundArray = get-childitem $element\$FileName | select-string  -Context 6,0 -pattern $searchPattern 

    if ($foundArray[0] -ne " ") {
       $newArray =@()
       $newstringArray =@()
       write-host $foundArray.Count
       #Split up the log lines via carriege returns
       $newArray = $foundArray -split  '[\r\n]' |? {$_}  
        $newStringArray = $newArray | select-string "Blah Blah Blah"
      write-host $newstringArray[0] 
      break 
    }     
}

Chris