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Full Discussion: Perl Regular Expression - Whitlist
Top Forums Shell Programming and Scripting Perl Regular Expression - Whitlist Post 88183 by vertigo23 on Tuesday 1st of November 2005 08:47:04 PM
Old 11-01-2005
a little more succintly, and taking advantage of perl's advanced regular expressions:

Code:
if ($var1 =~ m#[-\w/\.]+$#) {
    # do stuff
} else {
    # other stuff
}

in perl regexps, \w will match any alphanumeric and the underscore character. When you use an alternate delineator like #, you don't have to escape out '/'. Finally, using a + instead of a * outside of the grouping will require the expression to match at least one single character, whereas Ygor's will also match a blank string.

Hope this helps!
 

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LEARN ABOUT DEBIAN

cgsnapshot

CGSNAPSHOT(1)							 libcgroup Manual						     CGSNAPSHOT(1)

NAME

       cgsnapshot - generate the configuration file for given controllers

SYNOPSIS

       cgsnapshot [-h] [-s] [-t] [-b file] [-w file] [-f output_file]  [controller] [...]

DESCRIPTION

       cgsnapshot  generates the cgconfig compatible configuration file for the given controllers.  If no controller is set, then cgsnapshot shows
       all mounted hierarchies.  The output is in the same format as the cgconfig.conf configuration file.

       -b file
	      Display only variables from the blacklist.  The default location of the blacklist is /etc/cgsnapshot_blacklist.conf.  This list con-
	      tains  all  variables  which should be ignored by the cgsnapshot If the variable is blacklisted, it will not be displayed.  If it is
	      not present on the blacklist, the whitelist is checked.

       -h, --help
	      display this help and exit

       -f, --file
	      Redirect the output to output_file

       -s, --silent
	      Ignore all warnings

       -t, --strict
	      Do not display the variables which are not on the whitelist

       -w file
	      Set the blacklist configuration file.  This list contains all variables which should be displayed by cgsnapshot If the  variable	is
	      not  blacklisted,  the  whitelist is checked.  If the variable is on the whitelist, it is displayed by cgsnapshot If the variable is
	      not on the whitelist, the variable is displayed and a warning message is produced.  By default the whitelist is not used.

	      The warning message can be omitted using the -s, --silent flag.  If the -t, --strict flag is used, the variable which is not on  the
	      whitelist is not displayed.

       controller
	      defines the controller whose hierarchies will be output

FILES

       /etc/cgsnapshot_blacklist.conf
	      default blacklist

       /etc/cgsnapshot_whitelist.conf
	      default whitelist

       /etc/cgconfig.conf
	      default libcgroup configuration file

SEE ALSO

       cgconfig.conf (5)

Linux								    2010-07-28							     CGSNAPSHOT(1)
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