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If you want to do what is in the comments:
##First name should be equal to 8 digits
case $var in
([0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9])
echo "The first part of name equals 8 digits"
...

Well here you go...
(I also missed the "done" statement on my first post.)
#!/bin/bash
str="rajneesh_kumar"
IFS=_
ary=($str)
for key in "${!ary[@]}"; do echo "$key ${ary[$key]}";done
cat >...