Two seemingly identical sed commands, one works, the other doesn't. Can you tell me why?

There's something I'm having trouble understanding concerning sed behavior.

sed -n "/pattern/,$p" < input.inp > output.out

gives the following error

sed: -e expression n°1, caractère 10: `,' inattendue

(my system is in french).

sed -n '/pattern/,$p' < input.inp > output.out

Works fine

I've personnally used commands like

sed -n "/begin/,/end/p" < input.inp > output.out

with both single or double quotes, and they work just fine.

In case it's useful, I have sed version: sed (GNU sed) 4.2.2