How to get robocopy summary information involved in powershell?

Finally something people didn't answer in 10 seconds! I used your issue to continue to learn more about Powershell. The following works for me, I hope to see how others will slim down this code:

Clear-Host
$ErrorActionPreference = "Continue"
$DebugPreference = "Continue"
$VerbosePreference = "Continue"

@"

## robocopy_helper.ps1 ########################################################
Usage:        powershell -ExecutionPolicy Bypass -File ./robocopy_helper.ps1

Purpose:      Dry run before Full run of robocopy

History:      07/11/2014  -  Created
###############################################################################

"@

## User Supplied Variables
$cSrc = "C:\Temp"
$cDst = "C:\Temp2"
$cLog = "c:\robo.log"

## Robocopy Dry Run
$robo_test = robocopy "$cSrc" "$cDst" /E /L /FP

## Use Regular Expression to grab the following Table
#               Total    Copied   Skipped  Mismatch    FAILED    Extras
#    Dirs :         1         0         1         0         0         0
#   Files :         1         0         1         0         0         0
$robo_results = $robo_test -match '^(?= *?\b(Total|Dirs|Files)\b)((?!    Files).)*$'

## Convert Table above into an array
$robo_arr = @()
foreach ($line in $robo_results){
    $robo_arr += $line
}

## Create Powershell object to tally Robocopy results
$row = "" |select COPIED, MISMATCH, FAILED, EXTRAS
$row.COPIED = [int](($robo_arr[1] -split "\s+")[4]) + [int](($robo_arr[2] -split "\s+")[4])
$row.MISMATCH = [int](($robo_arr[1] -split "\s+")[6]) + [int](($robo_arr[2] -split "\s+")[6])
$row.FAILED = [int](($robo_arr[1] -split "\s+")[7]) + [int](($robo_arr[2] -split "\s+")[7])
$row.EXTRAS = [int](($robo_arr[1] -split "\s+")[8]) + [int](($robo_arr[2] -split "\s+")[8])

## If there are differences, lets kick off robocopy again
if ( ($row.COPIED + $row.MISMATCH + $row.FAILED + $row.EXTRAS) -gt 0 ){
    robocopy "$cSrc" "$cDst" /MIR /FFT /Z /W:5 /MT:64 /XX /log:$cLog
    Invoke-item $cLog
}
else { Write-host "Folders '$cSrc' and '$cDst' are twins" }

Note: I have changed the regular expression above from a period to a space immediately before the asterisk. This eliminates the risk of catching 'files' or 'dirs' or 'totals' in a filename/path. The original line is below for posterity.
jski 2014/07/16

$robo_results = $robo_test -match '^(?=.?\b(Total|Dirs|Files)\b)((?! Files).)$'

I realize that this is an older thread, but note that this can also be accomplished using the exit code returned by robocopy to determine whether any changes exist (a value of 0 indicates no changes). There are 2 ways to do this:

1. Run your robocopy statement above, and then in the next line, check the value of $LastExitCode.
2. Use Start-Process:

$RobocopyResult = Start-Process -FilePath robocopy -ArgumentList $RobocopyParams -Wait -PassThru
$RobocopyResult.ExitCode

If using Start-Process, it is important to use -PassThru, otherwise no value will be set in $RobocopyResult.

Other exit codes are listed at http://ss64.com/nt/robocopy-exit.html.