$re = '/(\d*)\.?\s?([^,]+),\s([^\d]+)\s?(\d+)\s((?:[A-Z]{3})?)\s?((?:(?!\d\:\d).)*)\s?((?:\d+:)?\d+\.\d+)(?:\s(\d+))?(?:\s((?:\d+:)?\d+.\d+))?(?:\s((?:\d+:)?\d+.\d+))?(?:\s((?:\d+:)?\d+.\d+))?(?:\s((?:\d+:)?\d+.\d+))?(?:Splash Meet Manager 11, Build \d{5} Registered to [\w\s]+ 2014-08-\d+ \d+:\d+ - Page \d+)?$/';
$str = '12. NUNEZ CHENG, Walter 74 Club Tennis Las Terr 3:44.57 123';
preg_match($re, $str, $matches, PREG_OFFSET_CAPTURE, 0);
// Print the entire match result
var_dump($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