Lex Program to check valid email
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 ./a.out
Let’s see lex program to check valid email.
Examples:
Input : csetanmayjain@gmail.com Output : Valid Input : !23@43.com Output : Not Valid
Below is the implementation:
/*lex code to accept a valid email */ %{ int flag = 0; %} %% [a - z.0 - 9 _] + @[a - z] + ".com" | ".in"flag = 1; %%main() { yylex(); if (flag == 1) printf("Accepted"); else printf("Not Accepted");} |
Output:
Want to learn from the best curated videos and practice problems, check out the C Foundation Course for Basic to Advanced C.
