regex matching rst code block?

[Edward K. Ream]

Here is a little regular expression puzzle.  I wish a regex that matches an 
rst code block, that is,



'::' followed by a group of lines all indented by at least as much as the 
first non-blank line following the '::'



My guess is that this is not possible.  Can anyone prove me wrong :-)



Edward

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Edward K. Ream   email:  edreamleo at charter.net
Leo: http://webpages.charter.net/edreamleo/front.html
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