1. a tool to search a file for structured pattern Sgrep (structured grep) is a tool for searching text files and filtering text streams for structured criteria. Sgrep implements a query language based on so called region expressions. Like grep, sgrep can be used for any kind of text files. However it is most useful for text files containing some kind of structured text. A file containing structured text could be defined as a file, which obeys some syntax. Examples of structured text files are SGML, HTML, C, Tex and mail files. From Debian 3.0r0 APT