Advanced Regular Expressions with Examples from SED.

摘要

This is the second of a series of papers, which the author has written on regular expressions. In UNIX documentation, the term regular expression is a generic term used to describe a search pattern applied to a body of text. In this reprint some of the more elaborate regular expressions made possible by the enhancements found in many of the UNIX text editors, and in particular in SED, are discussed. Specifically, the paper starts with a discussion of how to insert newlines into a document. It then proceeds on to subexpressions, and the unique capabilities they afford. It finishes with a somewhat lengthy description of the speed considerations involved with the use of complicated regular expressions. Computer Vision User Conference. (kr)