Welcome to Expressions for Jira:
Expressions for Jira helps Jira users to add Jira expressions that allow to customize the behavior of Jira workflow Validator, Conditions & now also introduces a suite of custom field types.
- Calculated Custom Fields (Text/Date/Number)
- Regex Validated Custom Field
How to Install the App:
Follow the link to "Expressions for Jira" from Atlassian Market Place. https://marketplace.atlassian.com/apps/1235038/expressions-for-jira?hosting=cloud&tab=overview