Using regexp blocks "Example URL"

I have used @-moz-document regexp( ) in a style, and it works as expected.
But when I uppload the code to userstyles.org, I can not enter an Example URL.

It gives the error code:
**************
1 error prohibited this style from being saved
There were problems with the following fields:
Example url does not match the sites specified in the code.
**************

- Is it possible to solve this?
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