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A new REX operator for set subtraction was added in Texis version 6,
the double-dash ("--"). This operator subtracts its right
side from its left side. For example, "[\alpha--x]" would match
any alphabetic character except "x". See the Vortex manual
on <rex>
(here)
for details.
Copyright © Thunderstone Software Last updated: Mon Feb 18 10:28:15 EST 2013
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