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Re: Experiences with match() subexpressions?

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On 11.04.2025 08:33, Aharon Robbins wrote:
> In article <vt9dre$3t3po$1@dont-email.me>,
> Janis Papanagnou  <janis_papanagnou+ng@hotmail.com> wrote:
>> The feature can be very useful,
>> but not for the case I was looking for. - Actually, it could have
>> provided the functionality I was seeking, but since GNU Awk relies
>> on the GNU regexp functions as they are implemented I cannot expect
>> that any provided features gets extended by Awk. - If GNU Awk would
>> have an own RE implementation then we could think about using, e.g.,
>> another array dimension to store the (now only temporary existing,
>> and generally unavailable) subexpressions.
> 
> Actually, this is not so trivial.  The data structures at the C level
> as mandated by POSIX are one dimensional; the submatches in parentheses
> are counted from left to right. There's no way to represent the
> subexpressions that are under control of interval expressions, which
> would essentially require a two-dimensional data structure.

Yes, that's why I had thought about a 2-dimensional array [on GNU
Awk level] so that arr[n][i] for i=1..z would contain the patterns.
This is what I actually tried with GNU Awk (before I had asked you)
to see whether there's some undocumented feature.

(I'm aware that things may get quite complicated if there's some
restrictions imposed (on "C"-level or else) which are in the way.)

> 
> Mike Haertel is writing a new regexp matcher for gawk; it was announced
> here some time agao: https://github.com/mikehaertel/minrx. The code is
> in the feature/minrx branch of the gawk Git repository.
> 
> I just opened an issue, https://github.com/mikehaertel/minrx/issues/43,
> about this question. We shall see what develops.

Oh, thanks for that. - My expectation had just been to check whether
such a feature is already available in GNU Awk (or could in a simple
way be made available with little effort). So I'm indeed interested
to hear whether that is a feasible and sensible feature. - Myself,
I have to admit, haven't yet thoroughly thought through about such a
feature. I've just seen it from the limited view of my application
context and thought it could be a worthwhile extension/generalization.

Janis

> 
> Arnold
> 

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Experiences with match() subexpressions? Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-04-10 09:06 +0200
  Re: Experiences with match() subexpressions? Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-04-10 09:09 +0200
    Re: Experiences with match() subexpressions? gazelle@shell.xmission.com (Kenny McCormack) - 2025-04-10 11:08 +0000
      Re: Experiences with match() subexpressions? Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-04-10 13:55 +0200
        Re: Experiences with match() subexpressions? gazelle@shell.xmission.com (Kenny McCormack) - 2025-04-10 14:04 +0000
          Re: Experiences with match() subexpressions? Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-04-10 23:39 +0200
            Re: Experiences with match() subexpressions? arnold@freefriends.org (Aharon Robbins) - 2025-04-11 06:33 +0000
              Re: Experiences with match() subexpressions? Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-04-11 09:10 +0200
                Re: Experiences with match() subexpressions? Kaz Kylheku <643-408-1753@kylheku.com> - 2025-04-11 08:22 +0000
                Re: Experiences with match() subexpressions? Manuel Collado <mcollado2011@gmail.com> - 2025-04-18 12:03 +0200
                Re: Experiences with match() subexpressions? gazelle@shell.xmission.com (Kenny McCormack) - 2025-04-18 12:01 +0000
                Re: Experiences with match() subexpressions? Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-04-18 14:24 +0200
              Re: Experiences with match() subexpressions? Kaz Kylheku <643-408-1753@kylheku.com> - 2025-04-11 07:40 +0000
              The new matcher (Was: Experiences with match() subexpressions?) gazelle@shell.xmission.com (Kenny McCormack) - 2025-04-11 08:57 +0000
                Re: The new matcher (Was: Experiences with match() subexpressions?) Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-04-11 15:50 +0200
              Re: Experiences with match() subexpressions? Kaz Kylheku <643-408-1753@kylheku.com> - 2025-04-11 17:54 +0000
    Re: Experiences with match() subexpressions? Ed Morton <mortonspam@gmail.com> - 2025-04-10 20:07 -0500
      Re: Experiences with match() subexpressions? Ed Morton <mortonspam@gmail.com> - 2025-04-13 12:52 -0500
        Nitpicking the code (Was: Experiences with match() subexpressions?) gazelle@shell.xmission.com (Kenny McCormack) - 2025-04-14 18:20 +0000
          Re: Nitpicking the code (Was: Experiences with match() subexpressions?) Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-04-14 20:53 +0200
            Re: Nitpicking the code (Was: Experiences with match() subexpressions?) Ed Morton <mortonspam@gmail.com> - 2025-04-14 18:55 -0500
              Re: Nitpicking the code (Was: Experiences with match() subexpressions?) Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-04-15 05:35 +0200

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