linux - shell script array range data from a variable -

i trying expand server names in host file, following format

#hostfile server0[1-2]1 server1[2-3]4 #end 

i manually changed entry in hostfile i.e server0[1-2]1 (server0{1..2}1) , tried following in bash shell , able expand variable:

my_array=(server0{1..2}1) printf '%s\n' "${my_array[@]}"  output: server011 server021 

but when try same through script not printing output in above mat here prints following:

server0{1..2}1 server1{2..3}4 

is problem in variable array conversion?

script: #!/bin/bash grep -ev '#|^$' hostfile | while read line; my_array=() if [ echo $line|grep -c 'host1' -eq 1 ]; echo $line >> new_hostfile elif [ echo $line|grep -c '^s' -eq 1 ] m=echo $line|sed -e 's/:/../g' -e 's/\[/{/g' -e 's/\]/}/g' my_array="($m)" printf '%s\n' "${my_array[@]}" >> new_hostfile fi; done

the output desired script is

server011 server021 server124 server134