$ echo 'cfg_a 
cfg_b[2:0] 
cfg_c[4:0] 
cfg_d '   |  perl -ne '($cf, $num) = ($1, $2) if /(cfg_\w+)(\[\d:\d\])*/; print "logic $num $cf\n"; 
' 
logic  cfg_a 
logic [2:0] cfg_b 
logic [4:0] cfg_c 
logic  cfg_d