How to find an ellipsis "..." ?

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Check it:

          let regexp = /your regexp/g;
alert( "Hello!... How goes?.....".match(regexp) ); // ..., .....
        

Solution:

let regexp = /\.{3,}/g;
alert( "Hello!... How goes?.....".match(regexp) ); // ..., .....

Please note that the dot is a special character, so we have to escape it and insert as \..