sed: delete all lines in a file using sentinel values

I want to do an inclusive delete from a file that looks like the following:

Some text
Some text
#$
Should be deleted
Should also be del开发者_Go百科eted
#$
More text

I want the file to read the following after sed is ran through it:

Some text
Some text
More text

the #$ values should be inclusively removed.

Can someone explain the sed command used to do this as well?

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Try this:

sed -e '/^#\$/,/^#\$/d' file

The idea is to match from the first time you see #$ to the second time, and then delete it.