Hi Marshall, Thank you very much for your reply.I tried your suggested regex its working. I am very happy with that and i am at learning stage so I got some understanding with your code that extract xml comments. also thank you very much for your suggetion in c code also i rectified that error also. now i am very happy because my problem solved. If incase i have more question on perl programming i will ask you.,because i am working with that. thank you , regards, veerubiji