substitute a regex in a string in batch - batch-file

Question

I need to delete everything starting with a word from a string in a windows batch script.
For example if I have the string:
This is my line delete from here.
I want to delete everything starting with the word delete and I need to obtain:
This is my line.
I have tryed this:
set line="This is my line delete from here"
set word="delete"
set delete="!word!*";
set line=!line:%delete%=!
It doesn't work what I have tryed, I have activated delayed expansion, and I am not sure if this: "set line=!line:%delete%=!" works. I have tryed this too "set line=!line:!delete!=!" but doesn't work either. I am new with batch scripting.
UPDATE:
In a loop I can only do delayed expansion, and this code doesn't work:
#ECHO OFF
setlocal
for /F "delims= " %%A in (temp.txt) do (
set "line=This is my line delete from here"
ECHO original:%line%:
set "word=delete"
CALL set "delete=%%line:*%word%=%%"
ECHO delete the "%word%%delete%" part
CALL set "line=%%line:%word%%delete%=%%"
ECHO final :%line%:
)
endlocal
Output:
original::
=%" was unexpected at this time.
delete the "" part
=%" was unexpected at this time.
final ::
But if I remove the for from the code above, the output is:
original:This is my line delete from here:
delete the "delete from here" part
final :This is my line :
My question is how can I do the same thing in a loop, with delayed expansion, as with normal expansion. I need in other words late expansion for both variables in the substitution expression the inner and the outer (set "delete=!line:*!word!=!", doesn't work). I can not find any documentation on that.
Thanks.

Answer 1

#ECHO OFF
SETLOCAL
set "line=This is my line delete from here"
ECHO original:%line%:
set "word=delete"
CALL set "delete=%%line:*%word%=%%"
ECHO delete the "%word%%delete%" part
CALL set "line=%%line:%word%%delete%=%%"
ECHO final :%line%:
GOTO :EOF
This should show you the steps.
First, delete the part up to and including the word. Then delete the word and the rest-of-line (in delete)
Note the placement of the quotes - to control the set not the value assigned.

Answer 2

I have read this and the updated code based on Magoo's answer:
#ECHO OFF
setlocal
for /F "delims= " %%A in (temp.txt) do (
set "line=This is my line delete from here"
set "word=delete"
echo line is: !line!
for /f "delims=" %%a in ("!word!") do set delete=!line:*%%a=!
echo delete is: !delete!
for /f "delims=" %%a in ("!word!!delete!") do set line=!line:%%a=!
echo line is: !line!
)
endlocal