Get-Content $tempDir$todaysLog | Where-Object { $_ -match "" } |
    ForEach-Object -Process {
    $fields = [regex]::split($_,'@|s+')
    Add-Content -Path $importSource2$todaysLog -value ($($fields[0]) + "`t"  + $($fields[1]) + "`t" + $($fields[2]) + " " + $($fields[3])+ "`t" + "<*sender*@"+($($fields[5])) + "`t" + "<*recipient*@"+($($fields[7])))
    }

cat $tempDir$todaysLog |
  %{ [regex]::Replace($_, "[A-Z0-9._%+-]+(@[A-Z0-9.-]+.[A-Z]{2,4}s<[')[A-Z0-9._%+-]+(@[A-Z0-9.-]+.[A-Z]{2,4}']>)", '*sender*$1*recipients*$2', "IgnoreCase") } > $importSource2$todaysLog

Measure-Command {

Get-Content $tempDir$todaysLog | Where-Object { $_ -match "" } |
    ForEach-Object -Process {
    $fields = [regex]::split($_,'@|s+')
    Add-Content -Path $importSource2$todaysLog -value ($($fields[0]) + "`t"  + $($fields[1]) + "`t" + $($fields[2]) + " " + $($fields[3])+ "`t" + "<*sender*@"+($($fields[5])) + "`t" + "<*recipient*@"+($($fields[7])))
    }

}

Measure-Command {

Get-Content $tempDir$todaysLog | Where-Object { $_ -match "" } |
    ForEach-Object -Process {
    $s2 = $_ -replace "t[^@t']+@", "`t*sender*@"
    $s3 = $s2 -replace "<['.+@", "<['*recipient*@"
    Add-Content -Path $importSource2$todaysLog -value $s3
    }

}

Measure-Command {

cat $tempDir$todaysLog |
  %{ [regex]::Replace($_, "[A-Z0-9._%+-]+(@[A-Z0-9.-]+.[A-Z]{2,4}s<[')[A-Z0-9._%+-]+(@[A-Z0-9.-]+.[A-Z]{2,4}']>)", '*sender*$1*recipients*$2', "IgnoreCase") } > $importSource2$todaysLog

}

$s1 = "10.197.71.28 SG  02012009 00:00:00	sender@kpmg.com	<['recip@kpmg.com.sg']>"
$s2 = $s1 -replace "t[^@t']+@", "`t*sender*@"
$s3 = $s2 -replace "<['.+@", "<['*recipient*@"
write-host $s3