I get 'tuple index out of range' when I use jenkins job builder to create a simple job contain a 'validating-string-parameter' below.

        - validating-string:
            name: RELEASE_DATE
            regex: '^[0-9]{4}'
            msg: 'Bad format of the date - use: YYYY-MM-DD'

Error message

IndexError: tuple index out of range

I changed regex macro to [0-9][0-9][0-9][0-9] and it didn't get error anymore