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Full Discussion: Expect and regex
Top Forums Shell Programming and Scripting Expect and regex Post 302413127 by professorx on Wednesday 14th of April 2010 04:01:28 PM
Old 04-14-2010
Expect and regex
I'm using Expect to execute a command on a router and return the output to a file. The output is a list. At the end of the list there's a statement that reads, "Found 165 active connections" (Where "165" could be any number between 0 and 2000.) I'm familiar with using Expect to return data from a router, but I'm a noob when it comes to using regex to parse that information. In this case, I only want to return the number to a file. I figured I could do that with an expression like
Code:
(?<=Found\s)\d+

. However, this doesn't work when rolled into the Expect script. Here's what I have less the router login stuff:

Code:
set log [open "/var/tmp/file.txt" "w"]
set accum {}
expect {
        -regexp {(?<=Found\s)\d+} {
            set accum "${accum}$expect_out(0,string)"
            exp_continue
        }
    }
puts $log $accum
expect "$prompt"

I'm getting: "couldn't compile regular expression pattern: quantifier operand invalid" I assume that's from the braces, but I've messed with the syntax several different ways and can't seem to nail it. Hopefully someone with more Expect/Regex experience can assist. Thanks.
 

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LEARN ABOUT DEBIAN

xorpsh

xorp(1) 						      General Commands Manual							   xorp(1)

NAME

       xorpsh -- XORP Command Shell

SYNOPSIS

       xorpsh [-c command]  [-t directory]  [-e]  [-h]	[-v]

DESCRIPTION

       This manual page documents briefly the xorpsh command.

       This manual page was written for the Debian distribution because the original program does not have a manual page.

       xorpsh  is  the command used to interact with a eXtensible Open Router Platform (XORP) router. This command starts up a command line inter-
       face (CLI), that allows the configuration of the router and monitoring of the router state.

       The xorpsh command provides an interactive command shell to a XORP user, similar in many ways to the role played by a  Unix  shell.   In  a
       production  router  xorpsh might be set up as an user's login shell - they would login to the router via ssh and be directly in the xorpsh.
       It can also be run directly from the Unix command line.

       xorpsh should normally be run as a regular user; it is neither necessary or desirable to run it as root.  If an user is to be permitted	to
       make changes to the running router configuration, that user needs to be in the Unix group xorp.

       The  Debian  package installation automatically sets up both a xorp user and a xorp group to which this user belongs. However, any user can
       run the xorpsh command unless locally restricted by the administrator.

OPTIONS

       xorpsh allows the following options:

       -h	 Show summary of options.

       -v	 Print verbose information.

       -c command
		 Specify command(s) to execute.

       -t directory
		 Specify templates directory.

       -e	 Exit immediately if cannot connect to the rtrmgr

SEE ALSO

       xorp_rtrmgr (8)

       This program is documented fully in the Xorp User Manual, chapter Command Structure, available at /usr/share/doc/xorp-doc/ in  Debian  sys-
       tems when the xorp-doc package is installed.

AUTHOR

       XORP is Copyright (c) 2001-2009 XORP, Inc.

       This  manual  page was written by Javier Fernandez-Sanguino jfs@debian.org for the Debian system (but may be used by others). For licensing
       details please see /usr/share/doc/xorp/copyright.

																	   xorp(1)
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