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Full Discussion: sed non-greedy pattern matching with wildcard
Top Forums UNIX for Dummies Questions & Answers sed non-greedy pattern matching with wildcard Post 302591727 by TobyNorris on Friday 20th of January 2012 11:35:59 AM
Old 01-20-2012
sed non-greedy pattern matching with wildcard
Code:
Toby> cat sample1
 
This is some arbitrary text before var1, This IS SOME DIFFERENT ARBITRARY TEXT before var2
 
Toby> sed -e 's/^This .* before //' -e 's/This .* before //' sample1
 
var2

I need to convert the above text in sample1 so that the output becomes

var1, var2

by stripping away two different sets of arbitrary characters that occur before var1 and var2.

My attempt above apparently fails because the use of the wildcard and * will greedily match all the way to the last occurence in the line instead of the first occurence.

Can anyone please give me the sed command that will work for this?

Thanks
Last edited by radoulov; 01-20-2012 at 12:38 PM.. Reason: Code tags, please!
 

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LEARN ABOUT OSX

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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