The PHP function, preg_grep, is used to search an array for specific patterns and then return a new array based on that filtering follow below code with string to array and array to search specifc word(character). You may also like PHP array_search() Function and How to search record in mysql codeigniter.
Code
$Item = $_POST['item'];
$getitem = nl2br($Item);
$haystack = explode('<br />',$getitem);
$trimmed_array=array_map('trim',$haystack);
$EMS = preg_grep ('/^E(\w+)/i', $trimmed_array);
$Parcel = preg_grep ('/^C(\w+)/i', $trimmed_array);
$Registered = preg_grep ('/^R(\w+)/i', $trimmed_array);
$Traffic = preg_grep ('/^T(\w+)/i', $trimmed_array);
$court = preg_grep ('/^M(\w+)/i', $trimmed_array);