Email alert : how to configure an alert by an partial topic

I have a key2.
I wish create an alert that will light a special color LED when I receive email with a specific topic title.
I kkonw that the topic will contains these words "delivered by PSL".
But the problem that the topic email is more longer for exemple "the gift will be delivered by PSL".

I have created an alert (see picture below) with the words delivered by PSL but this alert didn't work because the email that I received has more words in topic.

Who could help me to configure the alert ? Must I use * or other symbol?

Thanks.

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