change <br /> to \n\r in firefox and chrome [closed]

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I have done text replacement in Javascript such that the <br /> tag will be replaced by the \n\r . This seems to work in IE8.开发者_开发知识库0 but not in chrome and firefox. why is that so? How can I make it work in chrome and firefox. Why does chrome and firefox not consider <br/> tags as <br/> but rather <br>?

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This seems to be working fine everywhere:

"Hello<br />World".replace(/<br\s*\/?>/ig, "\r\n");