Hi, I need some help to have a regexp which could replace : by - in this code:

my $cmd="arp -s $ipadress $_Globals{MAC_ADDRESS}";

system($cmd);
 actually
$_Globals{MAC_ADDRESS} is formatted like this :XX:XX:XX:XX:XX:XX and i wanted to 
put it like this: XX-XX-XX-XX-XX-XX
How can i do this thanks a regexp 
thanks for your precious help.


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