[function_seven]

I was sloppy in my own examples. I’d be perfectly satisfied with an AST, or regex, or other non-English explanation. But something that I can audit is what I’m after. Otherwise this tool would never be trustworthy enough to let lose on billions of rows of data, with silent errors occurring throughout. (Well, I guess it depends on the nature and importance of the data. Cat photos, meh. Drug prescriptions? Ahh!)

[jononor]

Maybe also synthesize and suggest property based tests, by one specify also some invalid examples. Then these checks could be ran for each transformation. For instance:

- 123 456 = 123456 valid

- 1234567 = 123567 not valid (dropped 4)

Properties:

- output may not contain whitespace

- no number characters may be dropped

- characters may not be reordered