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str = ' <br /> <br /> xx xxxx <br /> yyy<br />tttttttttttttt<br /> '
str = str.replace(/<br\s*\/?>| /gi, '<br />').replace(/(<br \/>){2,}/g, '<br />').replace(/^(<br \/>)+|(<br \/>)+$/g, ' ');
alert('|'+str+'|')