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I write a program that recognizes from a .txt elements enclosed by "{" and "}". The program print the result in another .txt file. When I run the command lex b4.l I have two errors on line 9
"bad character class" and "unrecognized rule"

What I have tried:

%{
#include<stdio.h>
%}
word [ab]+" "
nr [3-9][0-9][0-9]|[1-9][0,9]{3,}
el {nr}|([a-z][a-z})*[a-z}
list "{"{el}(,{el})+"}"
%%
{list} {printf("%s\n",yylex);}
(.*{word}.*){2,}\n {ECHO;}
.|\n;
%%
int main(int argc, char**argv){
FILE *g;
if(argc>0)
yyin = fopen(argv[1], "r");
if(!(g=fopen("a.txt", "w")))
fprintf(stderr, "error");
else
yyout=g;
yylex();
}
Posted
Updated 13-Dec-18 8:04am

1 solution

Quote:
el {nr}|([a-z][a-z})*[a-z}
The above rule looks incorrect to me (what is [a-z} ?).
 
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