How to add condition in regex.

Question

I have a text file in that there is a column which contains debit or credit amount in it like :

1000dr accountnolikesomething

2000cr accountnolikesomething

 

I want to make condition on dr or cr and based on condition it should come on debit or credit like:

debit credit  accountno

1000  ---       accountnolikesomething

---      2000    accountnolikesomething