JavaScript using regular expressions to look for words "19XX" or "18XX" in long string

I am trying to go through a string to find dates in format of 19XX o开发者_运维知识库r 18XX, where XX can be any integers. Here is the basic set up:

var myLongString = "The Cold War (Russian: Холо́дная война́, Kholodnaya voĭna) was the continuing state from roughly 1946 to 1991 of political conflict...";

function getDates(myLongString) {
    //use regular expressions to create a list of words in the "19XX" or "18XX" format
    //and then return that list

}

Thanks for any help.

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return myLongString.match(/\b1[98]\d\d\b/g);