Hi Team, the clean() function which helps in stripping additional spaces was not

Try using trim function.

I can replicate this on 7.10 - looks like a bug to me. I would suggest you raise a support case.

There seems to be a disconnect between what the documentation says and what the rule definition says. The documentation, agreeing with your original assumption, says "Returns the specified text after stripping it of additional spaces between characters." Source: forum.appian.com/.../Text_Functions.html
Note: this seems to essentially duplicate what the trim() function says.

On the other hand, the in-system rule definition says "The function will return the provided text, minus any characters not considered printable. (Performs opposite function of strip.)" - see attached screenshot. Spaces definitely are "printable", so the behavior you're experiencing is consistent with this description.

This is interesting Appian's documentation has clean as removes spaces but on the Appian Designer it has something else

Documentation:
forum.appian.com/.../Text_Functions.html

Appian designer:
The function will return the provided text, minus any characters not considered printable. (Performs opposite function of strip.)

I think I would still raise a support case as either the function is wrong our the documentation is wrong; either way, something needs fixing!

Thank you for bringing this to our attention.

@Eliot, Should I go ahead for raising a support ticket?

That is not necessary, thank you. As I noted on the other post you made, I've gone ahead and notified our Documentation team of the inconsistency.