embedded code in oro regex

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I am interested in implementing embedded code within
(as an extension to) ORO.  Has this been attempted before?
Are there any known issues?

For example, the expression:
  =20
   abc(?{some-interpretted-code})def

would match the input sequence abcSTUFFdef
if some-interpretted-code (language to be determined)
accepts STUFF.

I am open to any advice as to the best way to implement
this within ORO, and issues to consider.

Best,

Brian Bartell
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