When using the Field Extractor (FX) in Splunk to perform field extraction, any consistent character can be used as a delimiter. The Field Extractor allows users to define how fields areseparated in the raw event data, and as long as the delimiter is consistent, the FX tool can parse and extract the fields correctly.
References:
Splunk Docs: Field Extractor
Splunk Answers: Field extraction delimiters

The chart command with sum(price) by product, region will return a table where the total revenue (price) is aggregated (sum) for each product and sales region. This is the correct way to aggregate data in Splunk.
References:
Splunk Docs - chart command