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On 16/05/2011 14:26, steve donovan wrote:
When in doubt, use a few patterns...

When in doubt, look in the reference... :-)
You can make a char class optional, but not a group.
Alternatively, there are Lpeg or Re libraries bindings.
Or, as Steve suggests (if I understood correctly), replace such structure with some limited tests chained together by some logic.

--
Philippe Lhoste
--  (near) Paris -- France
--  http://Phi.Lho.free.fr
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