It's more about list manipulation rather than string manipulation. But you 
could use it for string manipulation like this:

<$vars mystr="The knights who say ni">
<$list filter="[<mystr>split[ ]] doctors +[replace[knights]join[ ]]"/>
</$vars>

Extended to a larger group, this version will change "Operator" to 
"Function" for items at tiddlywiki.com

<$list filter="[regexp:title[\bOperator\b]!search:title[Example]]" 
variable="mystr">
<$list filter="[<mystr>split[ ]] Function +[replace[Operator]join[ ]]">

</$list>
</$list>


On Saturday, March 28, 2020 at 11:28:50 PM UTC-7, Mohammad wrote:
>
> There is a replcae operator one can found it and examples here
>
> https://tiddlywiki.com/prerelease/#replace%20Operator
>
>
> I appreciate if somebody explain what is the purpose of this operator and 
> give a real use-case!
>
>
> --Mohammad
>

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