language: PHP (php 5.4.4)
date: 457 days 20 hours ago
link:
visibility: public 
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<?php
 
$tweet = "RT @foRTunemagazine Comment here RT @foo Blah";
$tag = ' {RT} ';
$result = preg_replace("/RT(?=\s)/", $tag, $tweet);
 
var_dump($result);