Update: Oh dear, this is what you get for posting first thing in the morning when you're still half-asleep. I just re-read your question and realised that the below doesn't actually give the desired output :(
Sort::Naturally will handle this job, and is certainly a much simpler solution.
#!/usr/bin/perl -w
use strict;
use Sort::Naturally;
my @unsorted = <DATA>;
my @sorted = nsort(@unsorted);
print @sorted;
__DATA__
workstation_1_1
voiceserver_1_1
workstation_1_2
voiceserver_1_2
Gives...
voiceserver_1_1
voiceserver_1_2
workstation_1_1
workstation_1_2
Note that while this is much simpler than the other solutions, it may not necessarily be the most efficient. If you're only dealing with a relatively small dataset this probably isn't a concern. Otherwise, you might need to do some Benchmarking.
Hope this helps,
Darren :)
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