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while ($parse =~ s!(\d{1,2})/(\d{1,2})(?:-(\d{1,2}))?!!) { $end = $3 ? $3 : $2; print "untagged Interface GigabitEthernet $1/$_\n" for ($2 .. $end) }
#!/usr/bin/perl use strict; ... __DATA__ untagged Interface GigabitEthernet 1/2,1/3-5,1/12,1/40