title: How to add multiline option on RegularExpression attribute?
body: <p>I am using:</p>
  
  <pre><code>[RegularExpression(@"^(""|\[)?[a-zA-Z0-9']{1,125}(""|\])?$")]
  </code></pre>
  
  <p>to make sure each line of a multiline textbox is properly matched. I cannot however figure out how to add the global flag and multline flag options. Is it impossible with MVC? What other options do I have?</p>