How do I remove all the <br> tags from a string

I have a big string like

Hello
I am a On then sake home is am leaf
 Of suspicion do departure at extremely he 
believing.
 Do know said mind do rent they oh hope of 
 General enquire picture letters garrets on
offices of no on
 Say one hearing between excited evening all inhabit thought you
 Style begin mr
heard by in music tried do
 To unreserved projection no introduced invitation
 .... 1200 words.

Now I want to replace those
tags with " ". I don't know regex, can someone please help me ? And I used javascript string replace and it didn't work.