Lex Program to check valid email
Last Updated :
30 Sep, 2022
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:
%
{
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:
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