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@ 2014-05-08T14:21:35Z

<?php

$message = "
[xxxStudent.address_1xxx][xxxStudent.address_2xxx][xxxStudent.address_3xxx]
[xxxStudent.townxxx]
[xxxStudent.countyxxx]
[xxxStudent.postcodexxx]
[xxxStudent.country_iso_2xxx]";

preg_match_all('/\[xxx(\w+[\.+\w+]+)xxx\]/', $message, $tags, PREG_SET_ORDER);

var_dump($tags);

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
preg_match_all: documentation ( source)

preferences:dark modelive preview

40.63 ms | 402 KiB | 5 Q