> search for a string "run", I do not need to find "ran" but I
> do want to find it in all of these strings below:
> 
> Fox is running fast
> !%#^&$run!$!%@&$#
> run,run


With NGramFilter you can do that. But it creates a lot of tokens. For example 
"Fox is running fast" becomes 

F
        
o
        
x
        
Fo
        
ox
        
Fox
        
i
        
s
        
is
        
r
        
u
        
n
        
n
        
i
        
n
        
g
        
ru
        
un
        
nn
        
ni
        
in
        
ng
        
*run*
        
unn
        
nni
        
nin
        
ing
        
runn
        
unni
        
nnin
        
ning
        
runni
        
unnin
        
nning
        
runnin
        
unning
        
running
        
f
        
a
        
s
        
t
        
fa
        
as
        
st
        
fas
        
ast
        
fast


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