Link JIRA issues via automation when a ticket ID is mentioned in description

[Rebecca]

Hi, 

I need an automation to link issues to an existing one which is mentioned in the description field.

Case: Users write one or more JIRA ticket IDs in the description field of a new ticket when it is created. I'd like to automatically link the newly created issue with the mentioned ones from the description field (create an issue link).

Therefore I used this regex in the Automation action "Link issue to":{{issue.description.match(“([A-Z]+-\d+)”)}}

However, it is not working.

Does anyone know why or can help me with a different solution?