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Date: Thu, 24 Mar 2011 17:41:09 +0100
From: Georg Bauhaus <rm.dash-bauhaus@futureapps.de>
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Subject: Re: GNAT.Regpat problem.
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Date: 2011-03-24T17:41:09+01:00
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On 24.03.11 15:04, Peter C. Chapin wrote:
> On Thu, 24 Mar 2011, Dmitry A. Kazakov wrote:
> 
>> Just curious, why are you using regular expressions when GNAT offers Spitbol
>> patterns?
> 
> Spitbol patterns seemed like overkill.

Just yesterday I wrote me a SPITBOL program to
rummage in log files.  That was quickly done,
performed as expected, and nothing got killed
except the bugs that got traced in the log.

The trick is to use simple patterns. (They are typed,
and can be debugged incrementally as needed. That's
unlike UNIX V7 RE strings, which either work, or don't
work, but how do you inject tracing the point of
failure?)

FTR, in SNOBOL-4 syntax,

        Space = " " CHAR(9)
        Pattern = POS(0) (SPAN(Space) | NULL) "xyzzy" RPOS(0)