Regex: Remove all match plus one char before all

[zivoni]

  I tried exactly same thing yesterday. But it didnt work at all, neither it worked in terminal, so I think that parsing <BS> is done at the end in the terminal ...

Output:
jacq /tmp> /bin/echo -e "123\b45" 
1245
jacq /tmp> /bin/echo -e "123\b45" | hexdump -C
00000000  31 32 33 08 34 35 0a                              |123.45.|      # <-- still there