The Regular expression renderer post function can be used for replacing a sub-string in the content of another field. The replacing string is defined by the content of another field. You can implement this same behavior using more advanced features like Copy parsed text to a field or Format field value post-functions.

Select the field to be checked against the regular expression (e.g., Assignee).

Select the field to read the replacement value from. (e.g., Reporter).

Enter plain text representing a valid regular expression and optionally use field codes to insert field values. The expression will be used to match the sub-string in the selected target field.

You have the option to Update issue immediately (a specific entry will be created in issue history for this field writing).