lower case without removing numbers

It sounds like you'll need the Rename By Replacing operator and write some REGEX to skip over the numbers in your attribute names.

yes agreed.  I would also just try changing the order of that expression.  Looks like you're trying to use RegEx after "lower" and "trim".  Try doing the replaceAll RegEx first.

Scott

Thanks. I have tried that, but unfortunately it doesn't work. It removes all characters and spaces, but when converting to lower case it still removes the numbers.

Any thoughts on what to add to make sure it doesn't do that ?

If these are nominal values, then I would definately use the Replace operator and do the regex first to remove the puncuation AND then do the lowering/trimming. 

Just doing a regex with \W selects all the puncuation and then replace with either a "_" or nothing will get rid of the puncutation. If that's not the desired effect then I would consider splitting off the numbers, doing the lower/trim, and then rejoin the numbers.

This works! Thanks!