$re = '/(.*)(\\\\)(.*)/m';
$str = 'Z:\\sites\\TSS-GMS2\\TSS\\Shared Documents\\TSS Depot Operations (Still)\\TSS Depot Test Equipment
Z:\\sites\\TSS-GMS2\\TSS\\Shared Documents\\TSS Depot Operations (Still)\\History
Z:\\sites\\TSS-GMS2\\TSS\\Shared Documents\\TSS Depot Operations (Still)\\2 - Supply Support Operations
Z:\\sites\\TSS-GMS2\\TSS\\Shared Documents\\TSS Depot Operations (Still)\\TSS Depot Operations Logbook
Z:\\sites\\TSS-GMS2\\TSS\\Shared Documents\\TSS Depot Operations (Still)\\TSS Depot Test.pptx
Z:\\sites\\TSS-GMS2\\TSS\\Shared Documents\\TSS Depot Operations (Still)\\PQDR Response
Z:\\sites\\TSS-GMS2\\TSS\\Shared Documents\\TSS Depot Operations (Still)\\Flightline Support Operations
Z:\\sites\\TSS-GMS2\\TSS\\Shared Documents\\TSS Depot Operations (Still)\\Shipping Track
Z:\\sites\\TSS-GMS2\\TSS\\Shared Documents\\TSS Depot Operations (Still)\\AMS
Z:\\sites\\TSS-GMS2\\TSS\\Shared Documents\\TSS Depot Operations (Still)\\4 - Depot Operating Proc (DOP)
Z:\\sites\\TSS-GMS2\\TSS\\Shared Documents\\TSS Depot Operations (Still)\\1 - Depot Repair Operations
Z:\\sites\\TSS-GMS2\\TSS\\Shared Documents\\TSS Depot Operations (Still)\\0 Transition Lu
Z:\\sites\\TSS-GMS2\\TSS\\Shared Documents\\TSS Depot Operations (Still)\\Cost Analysis
Z:\\sites\\TSS-GMS2\\TSS\\Shared Documents\\TSS Depot Operations (Still)\\5 - Audits
Z:\\sites\\TSS-GMS2\\TSS\\Shared Documents\\TSS Depot Operations (Still)\\6 - Training Requirements
Z:\\sites\\TSS-GMS2\\TSS\\Shared Documents\\TSS Depot Operations (Still)\\DL
Z:\\sites\\TSS-GMS2\\TSS\\Shared Documents\\TSS Depot Operations (Still)\\3 - FSR Support
Z:\\sites\\TSS-GMS2\\TSS\\Shared Documents\\TSS Depot Operations (Still)\\TSS Depot Test Equipment\\Tool-Equipment Inventory.xlsx
Z:\\sites\\TSS-GMS2\\TSS\\Shared Documents\\TSS Depot Operations (Still)\\TSS Depot Test Equipment\\121029-Hand Tools.xlsx';
preg_match_all($re, $str, $matches, PREG_SET_ORDER, 0);
// Print the entire match result
var_dump($matches);
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for PHP, please visit: http://php.net/manual/en/ref.pcre.php