Populating a custom field with a substring from Summary

Question

I have a custom field I want populated with a piece of my Summary. I wrote a regex to help me doing that, and I validated it here.

(PRJ|INC|PRB|RITM|TASK|VUL|CHG|\wTASK)(\d+)

I created an automation rule, triggered whenever an issue is updated, trying to match this regex in my summaries:

And it works. Not only I see the SUCCESS status in Audit log, but also, I see the issue being updated by the rule:

However, the rule itself isn't updating the issue the right way. Here is how I set the rule (I tried not using the "additional fields" and choosing my custom field on the above dropdown instead, but got the same results). This is the update rule:

And this is the result I get:

Apparently, even though the "comparison regex" matches the entire Ticket Number (PRB1234567), the "update regex" gets only the first characters and ignore the numbers.

Any hints?

Thank you!

Kian Stack Mumo Systems · Accepted Answer

@Vinicius Zhu, you're really close! One modification is all you need. Wrap the two capture groups in another set of parens.

{{issue.summary.match("((PRJ|INC|PRB|RITM|TASK|VUL|CHG|\wTASK)(\d+))")}}