Add a custom linkification filter

Note: This feature can only be controlled by organization administrators.

Linkification filters make it easy to refer to issues or tickets in third party issue trackers, like GitHub, Salesforce, Zendesk, and others. For instance, you can add a filter that automatically turns #2468 into a link to

  1. From your desktop, click on the gear () in the upper right corner.

  2. Select Manage organization.

  3. On the left, click Filter settings.

  4. Under Add a new filter, enter a Regular expression and URL format string.

  5. Click Add filter.

If the pattern appears in a message topic, Zulip can't linkify the topic itself, since clicking on a topic narrows to that topic. So Zulip instead provides a little button to the right of the topic that links to the appropriate URL.

Understanding linkification regular expressions

This is best explained by example.

Hash followed by a number of any length.

  • Regular expression: #(?P<id>[0-9]+)
  • URL format string:
  • Original text: #2468
  • Automatically links to:

String of hexadecimal digits between 7 and 40 characters long.

  • Regular expression: (?P<id>[0-9a-f]{7,40})
  • URL format string:
  • Original text: abdc123
  • Automatically links to:

Linkifiers can be very useful, but also complicated to set up. If you have any trouble setting these up, please email with a few examples of "Original text" and "Automatically links to" and we'll be happy to help you out.