[ruby-talk:4592] Getting list of regexp matches

I'm sure looking forwards to buying the book. :)

I don't quite understand the concept of iterators. Let's say I have an array
of regexp's containing keywords, like:

  keywords = [ /int/, /float/, /double/ ]

then I have a file in variable, like:

  a = File.new("freddie.c").read(nil)

I can understand how to use iterators to go through the keywords array, but
not how to get an array of matches.

What I'd like out of this is a list of matches, like:

 [ "int",    [ 56, 78, 128 ],
   "float",  [ 90, 400 ],
   "double", [ 200, 250 } }

Is Ruby capable of iterating through regexp matches, or do I have to restart
regexp for every match, which is wasteful of resources?

Thanks...

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