Information can be extracted from unstructured documents using embodiments described herein. An entity recognition may be performed on an unstructured document and found entities may be annotated. Annotating includes inserting tags around the found entities to generate marked entities. A rule is applied to each of the marked entities in the unstructured document to generate a confidence value for every marked entity, wherein the rule comprises a plurality of prefixes for a target entity and a plurality of suffixes for the target entity. A marked entity with the highest confidence value is selected as an extraction target.