How can I use ListDeleteAt on a dotted comma separated list?

I have a comma delimited list of the following elemente:
sites.app.enroll.page5.degrees.gfdg,
sites.app.enroll.page5.degrees.aeetr,
sites.app.enroll.page5.degrees.sfdsd,
sites.app.enroll.page5.degrees.ur4gf,

I'd like to use the "listDeleteAt" function to take that list and remove everything after "degrees". Any ideas? I that this but it doesn't seem to work correctly. I still get all the text after the "degree."

this.recordset.node_base contains the list.

Thanks!

re: How can I use ListDeleteAt on a dotted comma separated list?

I figured it out. I have to do it this way. Adding the delimiter as part of my second argument:

re: How can I use ListDeleteAt on a dotted comma separated list?

That's correct, but you could've used ListLast(). See List functions.