regex - How to remove this empty <p><span>&nbsp;</span></p> tag using regular expression and php -

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i have requirement need remove piece of text.

<p><span>&nbsp;</span></p>

for example

<p><span>because coffee grinds stay in pod there virtually no cleaning either.</span></p> <p><span>&nbsp;</span></p> <p><span>hey presto, coffee, way every time. </span></p>.

i have tried to remove empty 

<p></p>

using regular expression 

$pattern1 = "/<p[^>]*><\\/p[^>]*>/";

how should modify remove empty tag 

<p><span>&nbsp;</span></p>

if need remove piece of code, don't need regex @ all. simple replace, using str_replace

$string = str_replace("<p><span>&nbsp;</span></p>", "", $string);

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