Sorry, I should have mentioned, it needs to be a macro. 
https://tiddlywiki.com/#Macros%20in%20WikiText

At the top of your tiddler:

\define my-macro() 

<$set name=pattern value="201909(0[1-9]|1[0-4])">
<$list filter="[regexp:created<pattern>]">

</$list>
</$set>
\end



Then, somewhere lower down (below all other macros if you have more than 
one) ...

<<my-macro>>

You can rename my-macro to anything that suits you: date-thing, if you want.


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