title: Grab any string starting with http up until first whitespace character in php
body: <p>I am having problems grabbing some text using preg_replace() in php. I am just trying to remove all text that starts with a http|https|www up until the first whitespace character. I am currently using:
      (http|https|www)\S+
  as my regex in preg_replace(). However I am getting this error when running the code:
      Warning: preg_replace(): Unknown modifier '\'
  I can use this same regex in a text editor, e.g. Sublime Text 2 with no problem. Any ideas why I am getting this error? Is there another way to grab the text I am looking for with a regex?</p>
  
  <p>Thanks for any help.</p>