Preg_match needs to search for a word, not any part of a word that matches

<?php // RAY_temp_tjyoung.php
error_reporting(E_ALL);
echo "<pre>";

// TEST STRINGS IN AN ARRAY
$arr = array
( 'This is a request to add or subscribe'
, 'This is a request to unsubscribe or addle'
, 'SuBscrIBE'
, 'Add.'
, '  Add.??!'
, 'AddSubscribe'
, 'Subscriber'
, 'unsubscribe'
, 'un-subscribe'
, 'Please remove me from the list'
)
;

// A REGEX TO FIND THE ADD OR SUBSCRIBE
$rgx_add
= '#'                           // REGEX DELIMITER
. '(\bADD\b|\bSUBSCRIBE\b)'     // WORD-DELIMITED "ADD" OR "SUBSCRIBE"
. '#'                           // REGEX DELIMITER
. 'i'                           // CASE-INSENSITIVE
;

// A REGEX TO FIND THE REMOVE OR UNSUB-SCRIBE
$rgx_rmv
= '#'                           // REGEX DELIMITER
. '(\bREMOVE\b|\bUN.*?SUBS*?)' // WORD-DELIMITED "REMOVE" OR VARIANT OF "UN-SUBSCRIBE"
. '#'                           // REGEX DELIMITER
. 'i'                           // CASE-INSENSITIVE
;

foreach ($arr as $str)
{
    echo PHP_EOL . $str;
    if (preg_match($rgx_add, $str)) echo " WANTS TO ADD / SUBSCRIBE ";
    if (preg_match($rgx_rmv, $str)) echo " WANTS TO REMOVE / UNSUB ";
}

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<?php

$From = $_REQUEST['From'];
$body = $_REQUEST['Body'];

header("content-type: text/xml");
echo  "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n";
?>

<Response>

<?php

include '../config.php';

	
if ((preg_match("/add/i", $body)) || (preg_match("/subscribe/i", $body))) {
	

}


 else if ((preg_match("/remove/i", $body)) || (preg_match("/unsubscribe/i", $body))) {

	


} else {?>
		<Sms>We're sorry. Our system did not understand your message. Please contact our station if you have any questions or concerns. Thank you.</Sms>
	<?php } ?>
	
</Response>

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