Not sure how to get into one field just using Tableau but three regex extracts would separate them. You could try split and pivot if you have access Tableau Prep, but I haven't tested doing that.
URL1 = REGEXP_EXTRACT([URL], "(.*)\n")
URL2 = REGEXP_EXTRACT([URL], "\n(.*)")
URL3 = REGEXP_EXTRACT([URL], "\n.*\n(.*)")
Hope this helps, if so please mark correct/helpful so others may find.
Thanks Nick. This is a cool technique but it would not be feasible for me to create a new column for each URL because my real data can have up to 104 different URLs.
Yeah, this definitely wouldn't work then. You'll need to split and pivot with a data prep tool before bringing it into Tableau then.