using sed to delete lines containing slashes /

Question

I know in some circumstances, other characters besides / can be used in a sed expression:

sed -e 's.//..g' file replaces // with the empty string in file since we're using . as the separator.

But what if you want to delete lines matching //comment in file?

sed -e './/comment.d' file returns

sed: -e expression #1, char 1: unknown command: `.'

Answer 1

You can use still use alternate delimiter:

sed '\~//~d' file

Just escape the start of delimeter once.