how to replace multiple occurrences of `&nbsp; and <br>`

how to replace multiple occurrences of &nbsp; and <br> at start of the string with j开发者_如何转开发avascript regex?

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myString = myString.replace(/^(&nbsp;|<br>)+/, '');

... where /.../ denotes a regular expression, ^ denotes start of string, ($nbsp;|<br>) denotes "  or <br>", and + denotes "one or more occurrence of the previous expression". And then simply replace that full match with an empty string.