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Full Discussion: Help with pattern matching
Top Forums Programming Help with pattern matching Post 302403909 by redoubtable on Monday 15th of March 2010 05:17:16 AM
Old 03-15-2010
Quote:
Originally Posted by drewk
For the SPECIFIC example you posted, this works.

Code:
$ echo "[[something and something [[like this]] and this [[but]] here is [[what]].]] [[another big string [[with other]] substrings.]]" \
| perl -nle 'print "$1\n$2" if (/\[\[(.*\]\]\.)\]\]\s+(\[\[.*\.)\]\]/);'
something and something [[like this]] and this [[but]] here is [[what]].
[[another big string [[with other]] substrings.
$

Are the "[[" the delimiters of something? Are the ".]]" the break to a new string? If so, there may be an easier regex combined with global matches or a loop.

I cannot recommend more highly using an interactive regex tool. What seems hard is really easy when you see it working realtime.

I use RegExr: Online Regular Expression Testing Tool but there are others, including ones that duplicate the specific regex flavor you are using.
Yes, that works, but the problem is that the strings change in size and in number of substrings, and the .]] also may change!

Another example:
Code:
[[something is something]] [[and then I was [[wondering]] why is  [[this like so]]]] [[anyway I think [[that]] I [[can]] go to]]]] [[blabla]] [[bla bla [[foo]] [[bar]]]] [[foobar]] [[not]]

The [[ ]] are the delimiters of the string, however that string can have substrings ALSO delimited by [[ ]]

Thanks for your reply...
 

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LEARN ABOUT LINUX

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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