That's shell glob expansion (not regex matching), so what you'll want is something like this 
open(TAR,"tar -czpf $target_file $logs/access_log.[0-9]*.gz |");

[download]
Which is roughly equivalent to $logs/access_log\.\d+\.gz in regex.
HTH

_________
broquaint

In reply to Re: Acceptable regular expressions within command line type syntax by broquaint
in thread Acceptable regular expressions within command line type syntax by Hagbone

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