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External Data Source

Source

Regular Expression
(?:(?:(?<=[\s^,(])\*(?=\S)(?!_)(?<bold>.+?)(?<!_)(?<=\S)\*(?=[\s$,.?!]))|(?:(?<=[\s^,(])_(?=\S)(?!\*)(?<underline>.+?)(?<!\*)(?<=\S)_(?=[\s$,.?!]))|(?:(?<=[\s^,(])(?:\*_|_\*)(?=\S)(?<boldunderline>.+?)(?<=\S)(?:\*_|_\*)(?=[\s$,.?!])))