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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 DEBIAN

nsd-checkconf

nsd-checkconf(8)						    nsd 3.2.12							  nsd-checkconf(8)

NAME

       nsd-checkconf - NSD configuration file checker.

SYNOPSIS

       nsd-checkconf [-v] [-h] [-o option] [-z zonename] [-s keyname] configfile

DESCRIPTION

       nsd-checkconf  reads  a	configuration  file. It prints parse errors to standard error, and performs additional checks on the contents. The
       configfile format is described in nsd.conf(5).

       The utility of this program is to check a config file for errors before using it in nsd(8) or zonec(8). This program can also be  used  for
       shell scripts to access the nsd config file, using the -o and -z options.

OPTIONS

       -v     After  reading  print  the  options  to  standard output in configfile format. Without this option, only success or parse errors are
	      reported.

       -h     Print usage help information and exit.

       -o option
	      Return only this option from the config file. This option can to be used in conjunction with the -z option.  The special value zones
	      prints out a list of configured zones.

	      This  option  is primarily used by nsdc to parse the config file from the shell. If the -z option is given, but the -o option is not
	      given, nothing is printed.

       -s keyname
	      Prints the key secret (base64 blob) configured for this key in the config file. Used to help shell scripts parse the config file.

       -z zonename
	      Return the option specified with -o for zone 'zonename'.

	      If this option is not given, the server section of the config file is used.  This option is primarily used by nsdc to parse the con-
	      fig file from the shell.

	      The -o, -s and -z option print configfile options to standard output.

FILES

       /etc/nsd3/nsd.conf
	      default NSD configuration file

SEE ALSO

       nsd(8), nsdc(8), nsd.conf(5), nsd-notify(8), nsd-patch(8), nsd-xfer(8), zonec(8)

AUTHORS

       NSD was written by NLnet Labs and RIPE NCC joint team. Please see CREDITS file in the distribution for further details.

NLnet Labs							   jul 19, 2012 						  nsd-checkconf(8)
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