Regexp problem <strong> balise

Hello,

I have a small regexp problem...

Many hours that I search solution, but I don't find

I have a string 

localisationBlock....many text......<p><strong>Agence CFI Mâcon</strong><br>6 grande rue de la Coupée<br>71850 Charnay lès Mâcon</p>

and <strong> and </strong> are not always present

I have my regexp : '(?s)localisationBlock.*?(?:<p><strong>|<p>)(.*?(?:</strong>)?)</p>.*?/div'

Thanks in advance