On Wednesday, November 28, 2012 07:23:17 PM Nikolai Kondrashov wrote:
> @(a&!(b))
This is the syntax ksh93 already uses. So far nobody else has adopted it, but
the equivalent as you already mentioned is the transformation to:
!(!(...)|!(...))
It's just a matter of implementing it. Other handy matching features still
missing are the non-greedy modifier for pattern-lists, arbitrary quantifiers,
and grouping for patterns (already supported for ERE only with BASH_REMATCH,
but there's no .sh.match equivalent.)
Of these, I think the non-greedy modifier and {n,m} quantifiers for patterns
would be my priorities because ERE doesn't support either non-greedy matching
or negative assertions, while only ERE supports custom quantification and
grouping. There's also no way to use ERE for globbing, only for pattern
matching, without also adding the ~(...) syntax, which would be a huge
undertaking.
--
Dan Douglas
