PHP Preg_replace for all instance of specific text?
<p>I have the following text and want to replace all instace which begin and end with ##, how can i prepare regular expression for preg_replace php.
Example</p>

<blockquote>
  <p>We are encountering a problem ##anytext## and will update you soon
  regarding this problem ##textsomethingelse##</p>
</blockquote>

<p>My question how can i replace all instance of ##anytext## with specific text?</p>
