This is the RefinePro knowledge base about OpenRefine. We build it over the years, and keep adding to it. From great tutorials and how-to, to handy GREL expressions and links to external resources, you will find here one of the most comprehensive list of resources to learn OpenRefine.

For a comprehensive documentation you should refer to the official OpenRefine wiki.

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Parsing and extracting HTML tag and links in Refine

I recently helped someone on stackoverflow to parse and extract information from an HTML page.  Refine with GREL offer multiple ways to select specific element and contant. This article will review the main functions and specific use cases to illustrate when to use them.