$re = '/^.*(?:EVENTS:OB:\s(?:RECORDS\snot|RECORDS\sthat|Unprocessed))(?!.*0\.0$).*$/mi';
$str = 'EVENTS:OB: Records not updated to status
EVENTS:OB: Records that were pending OR to be processed for yester day.
EVENTS:OB: Unprocessed records older than hour.
RENAS:OB:BOX: Unprocessed records older than hour.
RENAS:MOSS Pending
RENAS:TIGNET Pending
RENAS:OB:SI: Unprocessed records older than hour.
RENAS:OB:GC: Unprocessed records older than hour.
RENAS:RENAS:Count of pending message to process.
RENAS:OB:10+2_Status: Unprocessed records older than hour.
RENAS:RENAS_10+2:Unprocessed records in RENAS 10+2
RENAS:RENAS ACH:Count of pending message to process to FV.
RENAS:CheckNow:Count of pending message to process to FV
RENAS:OB:GB: Unprocessed records older than hour.
RENAS:RENAS: UN Processed records by MIXX for RENAS INSTRUCTONS
RENAS:RENAS: UN Processed records by MIXX for RENAS Break Bulk
RENAS:RENAS: UN Processed records by MIXX for RENAS
RENAS:OB:DOM:Unprocessed count of records older than hour.
RENAS:OB:DOM:Failed records in the database for previous date.
RENAS:OB:SI:Records that were pending to be processed for the previous day.';
preg_match_all($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