attached are some ast testregex tests that examine the pattern in your example
in the tests ~(A) is equivalent to ~(X)
testregex is in the ast-open package in src/cmd/re
the man page is online at www.research.att.com/sw/download/
testregex input data documents patterns, subject strings, and the expected
outcome,
including sub-group matches
the tests exposed a bug in ast:regsubcomp() that will be fixed in the next alpha
On Tue, 20 Aug 2013 22:31:38 +0200 Dan Shelton wrote:
> I may have found a bug in ~(X). AFAIK the first index (.sh.match[0])
> in .sh.match always lists all patterns for which matches have been
> found, and all following indexes (.sh.match[0..inf]) store the
> captured matches for a specific bracket pair, right?
> If that's correct, why does '15' appear in .sh.match[0][0] but no
> other match has '15' later?
> ksh -c 'x="a15 b2 c3" ; d="${x//~(X)(([[:alnum:]])&([[:digit:]]))+/}"
> ; print -v .sh.match'
> (
> (
> 15
> 2
> 3
> )
> (
> 5
> 2
> 3
> )
> (
> 5
> 2
> 3
> )
> (
> 5
> 2
> 3
> )
> )
> Dan
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# regex conjunction tests
A [[:alnum:]]+ a15 b2 c3 (0,3)
A ([[:alnum:]])+ a15 b2 c3 (0,3)(2,3)
A (([[:alnum:]]))+ a15 b2 c3 (0,3)(2,3)(2,3)
A [[:digit:]]+ a15 b2 c3 (1,3)
A ([[:digit:]])+ a15 b2 c3 (1,3)(2,3)
A (([[:digit:]]))+ a15 b2 c3 (1,3)(2,3)(2,3)
K +([[:alnum:]]) a15 b2 c3 (0,3)(0,3)
K +(([[:alnum:]])) a15 b2 c3 (0,3)(0,3)(2,3)
K +([[:digit:]]) a15 b2 c3 (1,3)(1,3)
K +(([[:digit:]])) a15 b2 c3 (1,3)(1,3)(2,3)
# the following group shows the difference between +(...) and (...)+ subgroup
reporting
A (([[:alnum:]])&([[:digit:]]))+ a15 b2 c3
(1,3)(2,3)(2,3)(2,3)
K ~(A)(([[:alnum:]])&([[:digit:]]))+ a15 b2 c3
(1,3)(2,3)(2,3)(2,3)
A (?K-a)+(([[:alnum:]])&([[:digit:]])) a15 b2 c3
(1,3)(1,3)(2,3)(2,3)
K +(([[:alnum:]])&([[:digit:]])) a15 b2 c3
(1,3)(1,3)(2,3)(2,3)
# the following group should be the equivalent
A/ /(([[:alnum:]])&([[:digit:]]))+/X/g a15 b2 c3 aX bX cX
K/ /~(A)(([[:alnum:]])&([[:digit:]]))+/X/g a15 b2 c3 aX bX
cX # regsubexec() BUG fixed #
A/ /(?K-a)+(([[:alnum:]])&([[:digit:]]))/X/g a15 b2 c3 aX bX
cX # regsubexec() BUG fixed #
K/ /+(([[:alnum:]])&([[:digit:]]))/X/g a15 b2 c3 aX bX cX
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