Although this could also effect ANY formula, the RegEx tool does not support a flag for Multiline. Often incoming data contains multiple lines of data and the user must replace new lines and carriage returns with a space or other delimiter in order to operate a regular expression on all of the data.
RegEx has a multiline flag (for Alteryx it would be a checkbox) that allows it to handle each line separately.
domain.com
test.com
site.com
if these are individual records, then \w+\.com$ works wonderfully, if these are all contained in a single EXCEL cell, then you need to write to community to figure out what to do.
Cheers,
Mark
