On 5/9/17 at 10:10 PM, [email protected]
(Jean-Christophe Helary) wrote:
I'm wondering if [] and | are equivalent for single characters
or if there are marginal cases where they would not be
equivalent ?
Though the expressions [ab] and a|b { or ([ab]) and (a|b) } are
functionally equivalent (provided that 'a' and 'b' are unitary
characters), I can't guarantee that they are logically
equivalent since the alternation operator has a lower precedence
(and that I can't think of a counter-example offhand doesn't
mean there isn't one :-).
Since however I would not ordinarily use these expressions
interchangeably, may I ask what your use case is?
Regards,
Patrick Woolsey
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Bare Bones Software, Inc. <http://www.barebones.com/>
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