Issue with tag pair detection?

Running into an issue where tag pairs detection is maybe over aggressive.

In the following code snippet the tag pair detected if from the first {ff-file} to the first matched closing tag. This isn’t quite what I need to happen as the first two occurrences of {ff-file} should be treated as single tags and not part of a tag pair. Essentially a pair should not contain an occurrence of itself for this extension.

Any ideas or suggestions on how to resolve this issue would be great!

<div>
<a href="http://{ff-file}">{ff-file}</a>
</div>

<div>
{ff-file}
<ul>
    <li>src = {src}</li>
    <li>thumbnail = {thumbnail}</li>
    <li>filename = {filename}</li>
    <li>width = {width}</li>
    <li>height = {height}</li>
    <li>width_height = {width_height}</li>
</ul>
{/ff-file}
</div>