Is it possible to format the input of a custom field?

[Enrico Listemann]

We currently use a custom field of type "Text Field (multi-line)" to add links to our internal systems which are related to the ticket. Is it possible to also format the input of a text field, e.g. by providing a script or regex, so that we can just enter an id and JIRA formats it as a link? E.g. "cms123" should be formatted as "http://our.cms.com/123".

[Wioleta Piechota]

There is a plugin for different formats of custom fields: https://marketplace.atlassian.com/plugins/pl.com.evercode.jira.jeasy-fields/server/overview

but it is only for JIRA server.

You can put your own masks for fields, set validation rules, rules for colouring fields content.

[GabrielleJ]

You are using JIRA Cloud so your options are limited.Try using a "URL" custom field.