title: String contains any character in group?
body: <p>I have a set of characters: \,/,?,% etc.
  I also have a string, lets say "This is my string % my string ?"</p>
  
  <p>I want to check if any of the characters are present in the string.</p>
  
  <p>This is not to check for a substring, but to check for a character in a set.</p>
  
  <p>I could do this:</p>
  
  <pre><code>my_str.find( "/" ) or my_str.find( "\\" ) or my_str.find( "?" )
  </code></pre>
  
  <p>but it's very ugly and inefficient.</p>
  
  <p>Is there a better way?</p>