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    # The following small library lets us create regex-matchers
    # and inverted regex-matchers.
...
              : ! $matcher->(@_)
        }
    }

    # With the above library, we can write our worker code without
    # having to specifiy whether we are interested in matching (=~)
...
            }
        }
    }

    # To demonstrate this approach, let us create a matcher for
    # your example pattern:
...
    JA300-JA302
    Nor do I match, my non-matching brother!
    JA320-JA394