tcsh way of pattern substitution

Question

I am using tcsh shell with Jenkins. In short, the matching suffix should be removed from the output.

Achieved in bash with the following.

cd ${WORKSPACE%${JOB_NAME}}

Case:

Given the following variables:

WORKSPACE = "/abc/def/ghi/jkl"
JOB_NAME = "ghi/jkl" 

The excepted output is:

/abc/def

With bash, echo ${WORKSPACE%${JOB_NAME}} would return abc/def for the example above. How can I achieve this with tcsh?

I have tried a few things:

echo "/abc/def/ghi/jkl" | sed "s|'ghi/jkl'|' '|g"

In this case, the output was: /abc/def/ghi/jkl, but I expected /abc/def/.