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    $\begingroup$ FWIW, you might consider something like StringCases["α β1 rpr0 other", RegularExpression["(\\w|[\[CapitalAlpha]-ω])+"]]. A bit cumbersome, but there ya go... with the caveat that this can't handle characters with tonos; you'll have to modify the regex as needed. $\endgroup$ Commented Apr 26, 2013 at 11:26
  • $\begingroup$ It'd good to be aware of this: forums.wolfram.com/mathgroup/archive/2009/Jul/msg00398.html $\endgroup$ Commented Apr 26, 2013 at 14:43