If you need to do anything other than display the results once you've isolated the uptime, you'll probably want a more useful value, such as seconds of uptime. Here's a script that will take an uptime statement and tell you the uptime in seconds. As with Stajich's solution, this may only work on uptimes of less than one year. 

#! /usr/bin/perl

use strict ;
use warnings ;

use Parse::RecDescent ;

my $rules = q{
startrule:        current_time 'up' uptime remainder eol
                    { $return = $item[3] ; }
current_time:     /\d+:\d+[AP]M/
uptime:           days(?) time
                    { $return = (@{$item[1]})[0] + $item[2] ; }
days:             number_days 'days,'
                    { $return = $item[1] * 86_400 ; }
number_days:      /\d+/
time:             hours ':' minutes
                    { $return = $item[1] + $item[3] ; }
hours:            /\d+/
                    { $return = $item[1] * 3_600 ; }
minutes:          /\d+/
                    { $return = $item[1] * 60 ; }
remainder:        /.+/
eol:              /^\Z/
} ;

my $parser = new Parse::RecDescent( $rules ) ;

my @tests = (
  '11:22PM  up  4:30, 2 users, load averages: 0.25, 0.42, 0.40',
  '6:37PM up 4 days, 2:05, 2 users, load averages: 1.99, 1.65, 1.47'
) ;

foreach my $test ( @tests ) {
     print $test . ': ' .
           $parser->startrule( $test ) . "\n";
}

[download]
Have fun!
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In reply to Re: pattern matching by DamnDirtyApe
in thread pattern matching by Anonymous Monk

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