title: How to escape a string for use in Boost Regex
body: <p>I'm just getting my head around regular expressions, and I'm using the Boost Regex library.</p>
  
  <p>I have a need to use a regex that includes a specific URL, and it chokes because obviously there are characters in the URL that are reserved for regex and need to be escaped.</p>
  
  <p>Is there any function or method in the Boost library to escape a string for this kind of usage? I know there are such methods in most other regex implementations, but I don't see one in Boost.</p>
  
  <p>Alternatively, is there a list of all characters that would need to be escaped?</p>