in reply to inserting few lines after matching a string?

Fun with one-liners: 
perl -pi -e 's/(printf\("hello buddy..\\n"\);\s+)/$1char \*point = new
+ char\[10\];\n/' file.txt

[download]

jeffa

L-LL-L--L-LL-L--L-LL-L--
-R--R-RR-R--R-RR-R--R-RR
B--B--B--B--B--B--B--B--
H---H---H---H---H---H---
(the triplet paradiddle with high-hat)

In Section Seekers of Perl Wisdom