hi monks, is there any way to do a call tree analysis using perl?

For eg: A c code function tree

display
-- audit
-- bass

elucent
-- audit
-- check

main
-- display
-- elucent
-- audit
-- check
[download]

In the above audit,bass,display,elucent,main,check are functions

The output should be like this

main display audit
main display bass
main elucent audit
main elucent check
main audit 
main check
[download]

Im extracting the function names and im having all the function names in an array..And the above function tree will be present in a .txt file.I have to open the .txt file and check for the word (main) which will be default in every conditions and i have to extract ansd write it to an excel sheet.Im a newbie and i just know to open and extract tags using regex from perl..help out monks...

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