How to match a three letter month?

When I want to match a month like
I match this at the moment with "[three-letters]", but safer would be to match it against "one of the twelve words Jan, Feb, Mar...".
Is this possible?
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Mar
I match this at the moment with "[three-letters]", but safer would be to match it against "one of the twelve words Jan, Feb, Mar...".
Is this possible?