Add some testcases for backslash interpretation.
Add some testcases for backslash interpretation.

OliverLetterer/discount,gm2bv/discount,binki/discount,davidfstr/discount,gm2bv/discount,binki/discount,binki/discount,OliverLetterer/discount,OliverLetterer/discount,davidfstr/discount,gm2bv/discount,binki/discount,davidfstr/discount,gm2bv/discount,binki/discount,davidfstr/discount