Browse Definitions :
Definition

Lex (lexical analyzer generator)

Lex is a program designed to generate scanners, also known as tokenizers, which recognize lexical patterns in text. Lex is an acronym that stands for "lexical analyzer generator." It is intended primarily for Unix-based systems. The code for Lex was originally developed by Eric Schmidt and Mike Lesk.

Lex can perform simple transformations by itself but its main purpose is to facilitate lexical analysis, the processing of character sequences such as source code to produce symbol sequences called tokens for use as input to other programs such as parsers. Lex can be used with a parser generator to perform lexical analysis. It is easy, for example, to interface Lex and Yacc, an open source program that generates code for the parser in the C programming language.

Lex is proprietary but versions based on the original code are available as open source. These include a streamlined version called Flex, an acronym for "fast lexical analyzer generator," as well as components of OpenSolaris and Plan 9.

This was last updated in February 2007

Continue Reading About Lex (lexical analyzer generator)

Start the conversation

Send me notifications when other members comment.

Please create a username to comment.

SearchCompliance

  • risk assessment

    Risk assessment is the identification of hazards that could negatively impact an organization's ability to conduct business.

  • PCI DSS (Payment Card Industry Data Security Standard)

    The Payment Card Industry Data Security Standard (PCI DSS) is a widely accepted set of policies and procedures intended to ...

  • risk management

    Risk management is the process of identifying, assessing and controlling threats to an organization's capital and earnings.

SearchSecurity

SearchHealthIT

SearchDisasterRecovery

  • call tree

    A call tree is a layered hierarchical communication model that is used to notify specific individuals of an event and coordinate ...

  • Disaster Recovery as a Service (DRaaS)

    Disaster recovery as a service (DRaaS) is the replication and hosting of physical or virtual servers by a third party to provide ...

  • cloud disaster recovery (cloud DR)

    Cloud disaster recovery (cloud DR) is a combination of strategies and services intended to back up data, applications and other ...

SearchStorage

Close