one-liner multi-line regex problem

[Kevin Horton]

I'm trying to write a perl one-liner that will edit an iCalendar 
format file to remove To Do items.  The file contains several 
thousand lines, and I need to remove several multi-line blocks.  The 
blocks to remove start with a line "BEGIN:VTODO" (without the quotes) 
and end with a line "END:VTODO" (also without quotes).

I've tried the following one-liner,
perl -p -i.bak -e 's/BEGIN:VTODO.*END:VTODO//sg' file_name_to_edit
The .bak file is created, which tells me the one-liner is finding my 
file, but the file is identical to the old one - i.e. the regex 
doesn't seem to be matching anything.

I'm also wondering whether my proposed one-liner (if it worked) would 
be too greedy.  Would it pull out everything between the first 
BEGIN:VTODO and the last END:VTODO?

I'd appreciate any hints.
Thanks,
Kevin Horton
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