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Full Discussion: Perl script: matching multiple lines error
Top Forums Shell Programming and Scripting Perl script: matching multiple lines error Post 302844327 by durden_tyler on Sunday 18th of August 2013 01:55:39 PM
Old 08-18-2013
I'll answer your second question first.

Quote:
Originally Posted by askari
if my original data is changed and added the additional parameter below. I have used your code above before but when I want to split it (e.g. halo1 data into two column by using regexp) is it possible in the while looping directly after the pattern is match?.

Code:
Pattern Gabriel
halo1 data
halo2 data
end
Pattern Andreas
halo1 data
halo2 data
end

Of course it is possible. Almost every kind of text processing is possible in Perl, if you know how to do it.

As an example:

Code:
$ 
$ 
$ cat -n input
     1    Pattern Gabriel
     2    halo1 data
     3    halo2 data
     4    end
     5    Pattern Andreas
     6    halo1 data
     7    halo2 data
     8    end
$ 
$ 
$ perl -lne 'BEGIN {$/=undef}
             while(/^(Pattern (\S+).*?end)/msg) {
               @x = split("\n",$1);
               print "Begin:",$x[0];
               for $i (1..$#x-1) {
                 print "Line = ", $x[$i];
                 ($col1, $col2) = $x[$i] =~ /^(\S+)\s+(\S+)$/;
                 print "col1 = ", $col1;
                 print "col2 = ", $col2;
                 print "=" x 20;
               }
               print "End:",$x[$#x]
             }
            ' input
Begin:Pattern Gabriel
Line = halo1 data
col1 = halo1
col2 = data
====================
Line = halo2 data
col1 = halo2
col2 = data
====================
End:end
Begin:Pattern Andreas
Line = halo1 data
col1 = halo1
col2 = data
====================
Line = halo2 data
col1 = halo2
col2 = data
====================
End:end
$ 
$ 
$

Now for your first concern about the file being huge - that is a subjective term. What may be a huge file for you may not be huge for Perl. A good idea would be to benchmark your processing and go from there.

Finally, if you want to put chunks of text into separate log files but still want to do line-by-line regex processing, then a simpler approach be to just:

- read your file line-by-line,
- start logging to the file when you encounter the start pattern
- use regexes for the following lines; do whatever you want to do with those
- and stop logging when you encounter the end pattern
 

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LEARN ABOUT MINIX

ppmtosixel

ppmtosixel(1)                                                 General Commands Manual                                                ppmtosixel(1)

NAME

       ppmtosixel - convert a portable pixmap into DEC sixel format

SYNOPSIS

       ppmtosixel [-raw] [-margin] [ppmfile]

DESCRIPTION

       Reads  a  portable  pixmap  as input.  Produces sixel commands (SIX) as output.  The output is formatted for color printing, e.g. for a DEC
       LJ250 color inkjet printer.

       If RGB values from the PPM file do not have maxval=100, the RGB values are rescaled.  A printer control header and a color assignment table
       begin the SIX file.  Image data is written in a compressed format by default.  A printer control footer ends the image file.

OPTIONS

       -raw   If  specified,  each  pixel  will  be explicitly described in the image file.  If -raw is not specified, output will default to com-
              pressed format in which identical adjacent pixels are replaced by "repeat pixel" commands.  A raw file is often an order  of  magni-
              tude larger than a compressed file and prints much slower.

       -margin
              If  -margin  is not specified, the image will be start at the left margin (of the window, paper, or whatever).  If -margin is speci-
              fied, a 1.5 inch left margin will offset the image.

PRINTING

       Generally, sixel files must reach the printer unfiltered.  Use the lpr -x option or cat filename > /dev/tty0?.

BUGS

       Upon rescaling, truncation of the least significant bits of RGB values may result in poor color conversion.  If the original PPM maxval was
       greater  than  100,  rescaling  also reduces the image depth.  While the actual RGB values from the ppm file are more or less retained, the
       color palette of the LJ250 may not match the colors on your screen.  This seems to be a printer limitation.

SEE ALSO

       ppm(5)

AUTHOR

       Copyright (C) 1991 by Rick Vinci.

                                                                   26 April 1991                                                     ppmtosixel(1)
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