Renaming Bulk files and changing certain prefix and raring them

I am using bash for renaming multiple script but it doesn't seem to work here is the sample filename i want to rename Continuum S02E13 [Number1Music.Us].mkv output Continuum S02E13 [bulkseries.com].mkv

for i in *.mkv;do mv $i ${i//[Number1Music.Us].mkv/[bulkseries.com.mkv]};done

and other question is to rar these files i havent tested it but it must be something like this.

for i in *.mkv;do rar a -m0 "$i.rar" "$i";done

Thanks in advance