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List:       ast-users
Subject:    Re: [ast-users] AND operator in shell syntax (equivalent to grep -X or ~(X))?
From:       Dan Shelton <dan.f.shelton () gmail ! com>
Date:       2013-08-28 11:47:18
Message-ID: CAAvCNcBcBqjAbHRu_oX=kXydLqrJ-ks7Kj8EP5EOmZZaw5C6Og () mail ! gmail ! com
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On 21 August 2013 16:01, Glenn Fowler <gsf@research.att.com> wrote:
>
> On Tue, 20 Aug 2013 22:13:11 +0200 Dan Shelton wrote:
>> Does the Korn shell pattern syntax have an AND operator equivalent to
>> & in grep -X or ~(X)?
>
> here is an example using var expansion editing
>
>         ksh -c 'v=abcd; print ${v/@(+([abc])&*([bcd]))/X}'
>
> you can see a more examples in the ast regex regression tests
>
>         cd $PACKAGEROOT/src/cmd/re
>         grep $'^K\t.*&' *.dat
>
> the *.dat file format man page is embedded in testregex.c in that same dir
>
> RE conjunction is typically combined with negation
> I use it this way a lot
>
>         print rm @(*.c&!(precious.c))
>
> you can test ksh93 patterns with grep but be sure to use the -x option
> because shell glob pattern matching is anchored
>
>         print $'foo.c\nprecious.c\nnotprecious.c' |
>         grep -Kx '@(*.c&!(precious.c))'
>
> should produce
>
>         foo.c
>         notprecious.c

Thanks. I wish you'd have EXAMPLE sections in the manpage.

Dan
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