Topic wizard: interactive visual tool for defining and disambiguating topics via regular expressions.

The Topic Wizard presented in this paper is a new interactive tool that supports the definition and revision of topics in form of regular expressions, combining a dialog for prefix and suffix extension with a word tree-based representation of phrases for restricting the query to specific expressions. The examples stem from the Media Watch on Climate Change , a public Web portal based on the webLyzard Web intelligence platform that aggregates environmental stakeholder communication from multiple online sources.