(non) GNU Flex (Lexical Analyzer) Reference Manual

挠曲（扫描仪发生器）参考手册

Flex is a fast lexical analyser generator. It is a tool for generating programs that perform pattern-matching on text. Flex is a free (but non-GNU) implementation of the original Unix lex program.

The Flex Reference Manual provides beginners with a simple introduction to the basics, and experts will find advanced details they need.

In this you will see the following things below.

- 1.0 Name

- 1.1 Synopsis

- 1.2 Overview

- 1.3 Description

- 1.4 Some simple examples

- 1.5 Format of the input file

- 1.6 Patterns

- 1.7 How the input is matched

- 1.8 Actions

- 1.9 The generated scanner

- 1.10 Start conditions

- 1.11 Multiple input buffers

- 1.12 End-of-file rules

- 1.13 Miscellaneous macros

- 1.14 Values available to the user

- 1.15 Interfacing with yacc

- 1.16 Options

- 1.17 Performance considerations

- 1.18 Generating C++ scanners

- 1.19 Incompatibilities with lex and POSIX

- 1.20 Diagnostics

- 1.21 Files

- 1.22 Deficiencies / Bugs

- 1.23 See also

- 1.24 Author

You will find all this section offline without any internet connection and learn Flex easily anywhere and anytime.