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From: "Kerry W. Lothrop" <kerry@lothrop.de>
Subject: Regular Expressions
Date: 2000/01/16
Message-ID: <38824937.78FFA393@lothrop.de>#1/1
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Organization: Comp.Center (RUS), U of Stuttgart, FRG
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Newsgroups: comp.lang.ada
Date: 2000-01-16T00:00:00+00:00
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Hello,

I've just started learning Ada and am having problems extracting
information from a text file (in this case it is a flight logger file).
I'm used to doing these things in Perl, so I've gotten used to regular
expressions, which seem to be available through the package GNAT.Regpat.

My first step is to identify the line I'm searching for. It starts with
an "H", maybe followed by a space, followed by a letter, maybe followed
by a space, followed by "PLT", maybe followed by a space, followed by
"PILOT:". I thought this pattern should be "^H ?. ?PLT ?PILOT:". The
relevant lines in my program are:

   while (not End_Of_File(File => File_Name)) loop
      Get_Line(File => File_Name, Item => Line, Last => Linlen);
      if Match(Expression => "^H ?. ?PLT ?PILOT:", Data => Line(1 ..
Linlen), Size => 10000) then
         Put_Line(Item => Line(1 .. Linlen));
      end if;
   end loop;

The pattern seems to match every line, because the program outputs all
the lines in the data file. If I just write the pattern "PILOT" it picks
out the right line. If I write the pattern "^H" it outputs all lines.

What is it I'm doing wrong? Has anyone worked with GNAT.Regpat?

One more thing: Once I have the line, how do I pick out the data after
the colon?


Thanks,

Kerry