%{
#include <stdio.h>
%}
 
%%
 
[+]+[0]{0,3}[-]+  { printf("(%s)", yytext); }  // Match the feature and surround it with parentheses
[^+\-0\n]+         { printf("%s", yytext); }   // Match any characters that are not part of the feature
[+\-0]+            { printf("%s", yytext); }   // Output other parts (like isolated +, -, or 0) as is
\n                 { printf("\n"); }           // Preserve newlines (row breaks)
 
%%
 
int main() {
    yylex();  // Start the lexer
    return 0;
}
 
int yywrap() {
    return 1;
}
 

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