How do I make part of a regular expression optional in Ruby?

Question

To match the following:

On Mar 3, 2011 11:05 AM, \"mr person\" 
wrote: 

I have the following regular expression:

/(On.* (?         


        

Answer 1

Sure, you just need to group the optional part...

   (at )*

And, ok, I guess that will match at at at at, so you might want to just do:

   (at )?