$re = '/.+Client\sName:\s(?<name>.+)\s+:\s+Client\sEmail:\s(?<email>.+)\s+:\s+Product\sName/m';
$str = 'Test School BV Client Name: test : Client Email: test@gmail.com : Product Name: test : Billing Cycle: 12 : Country: CO : Domain: test.com.';
preg_match_all($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