Compiler construction tools lex

Taking A Look at Yacc

Yacc (Yet Another Compiler Compiler) is a tool used to create a parser.
It parses the stream of tokens from the Lex file and performs the semantic analysis.
Yacc translates a given Context-Free Grammar (CFG) specifications into a C implementation y.tab.c.
This C program when compiled, yields an executable parser.
A Yacc file is in many ways, simila.

What are the tools for semantic analysis phase of compiler construction?

Compiler construction can be divided into several phases such as:

Lexical analysis

Syntax analysis

Semantic analysis and etc.
In lexical analysis, there are tools such as:Lex, Flex and etc.
In syntax analysis, there are tools such as:Yacc, Bison, etc.

What is a Lex tool?

Lex is a tool or a computer program that generates Lexical Analyzers (converts the stream of characters into tokens).
The Lex tool itself is a compiler.
The Lex compiler takes the input and transforms that input into input patterns.
It is commonly used with YACC(Yet Another Compiler Compiler).
It was written by Mike Lesk and Eric Schmidt. 1.

What is Lex in compiler design?

In this article, we will understand what is Lex in Compiler Design but before understanding Lex we have to understand what is Lexical Analysis.
It is the first step of compiler design, it takes the input as a stream of characters and gives the output as tokens also known as tokenization.

What Is Lex?

No, not Lex Luthor.
Lex is a tool used to create a lexical analyzer.
So what is lexical analysis.
It is the process in which a stream of characters is converted into a sequence of tokens.
Such programs are called lexers or tokenizers.
The file contains a set of regular expressions along with actions associated with each of them.
The output is a tab.

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