Multi tag replace between values

I have some script which makes replacements. It works fine, but because of replaced values standing close to each other i’ve got more than one
between values.

It looks like:

<br />
Value

<br />
Value

<br />


<br />
Value

<br />
Value

<br />


<br />
Value

<br />


<br />

<br />

My task is to get only one <br> between values:

<br />
Value

<br />
Value

<br />
Value

Because of not so many variations in my list I know one decision for all available variants but it is bad hardcode something like:

var mystring=`<br />


<br />`

for (i=0; i<mystring.length; i++){
          var regex = new RegExp(mystring[i],"g");
           mystring = mystring.replace(regex, "");
       }    

Is there any elegant way to solve my case? Thinking of regexp but it’s too hard for me to write it. Or may be there is another way?