8.1 Overview
This chapter introduces libraries and topics not seen so far, but it also extends and refines the coverage of earlier material. For example, the flexible library function system, for quick multiprocessing, is introduced; the input function scanf is examined more closely.
The chapter begins with regular expressions, a language designed for pattern matching, which makes the language well suited for verifying input. Indeed, professional data validation relies on regular expressions as a base level. The chapter then ...
