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Warp does it under the hood (you can do query by example directly on databases). See https://pixelspark.nl/2015/warp-a-query-by-example-analysis-...

Did you know the name "Query by example" was devised for a tool to generate SQL queries?

Both SQL queries and Regex expressions by example would be amazing.

Regex by example seems to be what this tool is doing. Maybe OP/author could add an option to view the constructed expressions?