ttp://www.cs.hmc.edu/tech_docs/qref/sed.html#basics

sed 's#.*/\([^/]*\)/.*#\1#'

's# .*/\([^/]*\)/.* # \1 #'

special characters that need a / before use = .*[]^$\
s = subsitude
# = delimiters
.* = match everyting until next part
/\([^/]*\)/ = 

[^/] = subsitue everyting that is not /

.* = match everyting until the end