Linux From Scratch
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# Installing Flex

## Installation of Flex

Install Flex by running the following commands:

> `./configure --prefix=/usr &&`
> `make &&`
> `make install &&`
> `cd /usr/bin &&`
> `ln -s flex lex`

## Contents

The Flex package contains the flex program

## Description

Flex is a tool for generating programs which recognizes patterns in text. Pattern recognition is very useful in many applications. A user sets up rules what to look for and flex will make a program that looks for those patterns. The reason people use flex is that it is much easier to set up rules for what to look for than to write the actual program that finds the text.

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