<?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.";
} 
?>
 
 

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