Flex reads the given input files, or its standardinput if no file names are given, for a description of a scanner to generate.The description is in the form of pairs of regular expressions and Ccode, called rules. Yaccturns such a specification into a subroutine that han-dles the input process frequently, it is convenientand appropriate to have most of the flow of control inthe user's application handled by this subroutine.Flex, A fast scanner generator Vern Paxsonflex is a tool for generating scanners: programs which recognized lexicalpatterns in text. Se adapta a toda clase de organizacin estudios unipersonales, medianos y grandes lo han usado ya por muchsimos aos en forma ininterrumpida y sabiendo que nuestro equipo trabaja constantemente. The Yacc user specifiesthe structures of his input, together with code to beinvoked as each such structure is recognized. Lex-Doctor es el sistema de gestin jurdica ms difundido de la Repblica Argentina, con una trayectoria de ms de 33 aos sirviendo en estudios jurdicos, asesoras letradas de bancos, empresas pblicas y privadas, municipalidades, fiscalas de estado y numerosos organismos estatales. Unfortunately, usual input facilities arelimited, difficult to use, and often are lax aboutchecking their inputs for validity.Yacc provides a general tool for describing theinput to a computer program. An input language may be as complexas a programming language, or as simple as a sequenceof numbers. JohnsonComputer program input generally has some structure in fact, every computer program that does inputcan be thought of as defining an ``input language'which it accepts.

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