Regex: matching any Number then a hyphen

Anonymous Monk has asked for the wisdom of the Perl Monks concerning the following question:

I have lines of data, all begin with a number. For lines which have a " - " or " – " after the number, but before the next piece of text I'd like to replace this with a ". ". example data

1234 - Foo
56778 – Bar
9999. Baz
[download]

desired output

1234. Foo
56778. Bar
9999. Baz
[download]

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