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Lex program to find the length of the longest word

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  • Difficulty Level : Basic
  • Last Updated : 30 Sep, 2022
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Lex is a computer program that generates lexical analyzers. Lex reads an input stream specifying the lexical analyzer and outputs source code implementing the lexer in the C programming language.

The commands for executing the lex program are:

lex abc.l (abc is the file name)
cc lex.yy.c -efl

Let’s see lex program to check valid email.


Input:  geeks for geeks
Output:  5

Input:  facebook google yahoo
Output:  8 

Below is the implementation:

/*lex code to find the length of the longest word*/
% {
  int counter = 0; %
% [a - zA - Z] + {
  if (yyleng > counter) {
    counter = yyleng;
} %
main() {
  printf("largest: %d", counter);


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