The best way to set a character limit on a custom field (no script required)

The best way i have found to set a character limit on a custom field is to add a regular expression check to the workflow transition.  This is much simpler than a groovy script.

 

Go to Project Setting > Workflows

Edit the workflow for the affected issue type

Switch to Diagram mode

On Create transition, click on the Validators

Choose Add Validator > Regular Expression Check

 

If you would like to restrict the field to a specific length:  enter [0-9]{n}$

 

(n) reflects your desired field length.

 

You just need to set this on the required workflow transition (ideally after the initial field input is required)

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