title: How to Replace by pattern with Regex in C#
body: <p>I have a text, the text contains char sequence which begins with # and ends with ="" characters. Between the # and ="" characters just exists alphanumeric characters, without space or ; chars.
  I tried to find the specified sequence with the following pattern <code>#[A-Za-z0-9]+(="")</code>
  My question is how can I replace the ="" characters with three question mark characters ??? in C#?  </p>
  
  <p>Thank you in advance.</p>