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Full Discussion: Perl :: to parse the data from a string.
Top Forums Shell Programming and Scripting Perl :: to parse the data from a string. Post 302833775 by durden_tyler on Wednesday 17th of July 2013 08:49:42 PM
Old 07-17-2013
Quote:
Originally Posted by scriptscript
...
Code:
$line = "Jul 13 00:08:55 dq01aipaynas01p %FWSM-6-302010: 2 in use, 1661: most used";
$line =~ m/(\%(.*)\:)/;
...
## printing %FWSM-6-302010: 2 in use, 1661:  but expected is %FWSM-6-302010:

...
A few thoughts on your regex:

(1)
Code:
.*

is a "greedy quantifier". It will match as much of the string as possible while still allowing the entire regex to match the string.

So the match starts from the "%" character and it matches as many characters as possible to reach the next ":" character. That is the reason the match goes beyond the first ":" character, and goes on till the second (and last) ":" character.

What you are looking for is a "non-greedy quantifier", which is formed by the usual quantifier appended by a "?". That will match as few characters as possible and stop at the first ":" after the "%" character.

Search for "non-greedy quantifier" in the official Perl regex tutorial : perlretut - perldoc.perl.org for a detailed review of this concept.

(2)
You don't need any of the braces
Code:
( )

unless you want to store the matched string in special variable
Code:
$1

and the part of the string between "%" and ":" in special variable
Code:
$2

(3)
"%" and ":" are not special characters, so you don't have to escape them. To see a legitimate list of special characters, search for "metacharacters" in the Perl regex tutorial: perlretut - perldoc.perl.org
 

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LEARN ABOUT CENTOS

paps

PAPS(1) 						      General Commands Manual							   PAPS(1)

NAME

       paps - UTF-8 to PostScript converter using Pango

SYNOPSIS

       paps [options] files...

DESCRIPTION

       paps reads a UTF-8 encoded file and generates a PostScript language rendering of the file. The rendering is done by creating outline curves
       through the pango ft2 backend.

OPTIONS

       These programs follow the usual GNU command line syntax, with long options starting with  two  dashes  (`-').   A  summary  of  options	is
       included below.

       --landscape
	      Landscape output. Default is portrait.

       --columns=cl
	      Number of columns output. Default is 1.

       --font=desc
	      Set the font description. Default is Monospace 12.

       --rtl  Do rtl layout.

       --paper ps
	      Choose paper size. Known paper sizes are legal, letter, a4. Default is A4.

       --bottom-margin=bm
	      Set bottom margin in postscript points (1/72 inch). Default is 36.

       --top-margin=tm
	      Set top margin. Default is 36.

       --left-margin=lm
	      Set left margin. Default is 36.

       --right-margin=rm
	      Set right margin. Default is 36.

       --help Show summary of options.

       --header
	      Draw page header for each page.

       --markup
	      Interpret the text as pango markup.

       --encoding=ENCODING
	      Assume the documentation encoding is ENCODING.

       --lpi  Set the lines per inch. This determines the line spacing.

       --cpi  Set the characters per inch. This is an alternative method of specifying the font size.

       --stretch-chars
	      Indicates  that  characters  should be stretched in the y-direction to fill up their vertical space. This is similar to the texttops
	      behaviour.

AUTHOR

       paps was written by Dov Grobgeld <dov.grobgeld@gmail.com>.

       This manual page was written by Lior Kaplan <kaplan@debian.org>, for the Debian project (but may be used by others).

								  April  17, 2006							   PAPS(1)
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