Joomla 3 content plugn foreach $row->fulltext duplicates

[vbarlakoski]

I am setting up a new content plugin for Joomla 3, that should replace plugin tags with html content. Everything works fine till the moment when i am preg_replace plugin tags in $row->fulltext.

Here is the plugin code

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public function onContentPrepare($context, &$row, &$params, $page = 0) {
$pattern = '#\{uni\}(.*){\/uni\}#sU';
    preg_match_all($pattern, $row->fulltext, $matches);

    foreach($matches[1] as $k=>$uni){

        preg_match('/\{uni-title\}(.*)[\{]/Ui', $uni, $unititle);
        preg_match('/\{uni-text\}(.*)/si', $uni, $unitext);

        $titleID = str_replace(' ', '_', trim($unititle[1]));

        $newString = '<span id="'.$titleID.'">'.$unititle[1].'</span><div class="university-info-holder"><div class="university-info"><i class="icon icon-close"></i>'.$unitext[1].'</div></div>';

        $row->fulltext = preg_replace($pattern,$newString,$row->fulltext);

    }
}

Any ideas, why it duplicates first found match, as many times as foreach goes?

Just to mention, if i do:

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echo $unititle[1];

inside the foreach, items are rendered as it should be.