title: regular expression to check for spammer
body: <p>I'm trying to figure out the regular expression for preg_match() that would return true for all of the following scenarios:</p>
  
  <p>1- strip spaces for people doing this "check out my website . com (no spaces)" </p>
  
  <p>2- find the obvious "mywebsite.com" in "check out mywebsite.com"</p>
  
  <p>3- find dot replacement "check out mywebsite dot com (no spaces)"</p>
  
  <p>4- be case insensitive</p>