sql - How to use Replace with % -

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i need exclude text "<==#" end (like %)

"testdescription  <==# info "dynamic text" ==>"

i tried use replace % not work 

select replace ( testfield, '<==# %', '') table

the following want:

 select left(testfield, charindex('<==#', testfield) - 1)

there no reason use wildcards this. want left part of string before substring.


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