Subscribe By Email Extension - QUESTION

Just wondering if anyone knows anything about the SubscribeByEmail extension.

I have it setup and working but am looking to extend it to say have multiple different words a user can use other than subscribe.

For Example
1. Subscribe
2. PHP

I believe i found the right file to edit, which is SubscribebyEmailWorker.php but how could i set it up to allow for multiple words??
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That would be interesting to know. I have just set up basic SbE and it works as long as "Subscribe" is the exact and only word in the subject line.

Have you managed to solve your issue?