<?php 
$text = "john123 john william johnw@hotmail.com 2015-05-09 13:21:41 2015-08-07 13:21:41 James James William William group1 2015-05-30 18:05:39"; 

$regex = '~([a-zA-Z]+) ([a-zA-Z]+ [a-zA-Z]+) ([-\w.+]+@[-\w.+]+\.[a-zA-Z]{2,4}) (\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}) (\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}) ([a-zA-Z]+ [a-zA-Z]+) ([a-zA-Z]+ [a-zA-Z]+) ([a-zA-Z]+) (\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2})~i';

if ( preg_match( $regex, $text ) ) {
     echo $text . " is a valid text. We can accept it.";
} else { 
     echo $text . " is an invalid text. Please try again.";
} 
?>