Two questions for custom expression:

Two questions for custom expression:

 

1) Why the sample result for the custom expression only evaluates for columns? (see image) I am trying to debug a regular expression   RXReplace("The Small Red Fox has a small tail","Small","Big","gi")  

but in the same way, I can only see sample result If I replace the first argument with a column, but can't debug different scenareos

 

 

2) can I put comments in a custom expression?  

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