regex
/******************************************************************************

                            Online C Compiler.
                Code, Compile, Run and Debug C program online.
Write your code in this editor and press "Run" button to compile and execute it.

*******************************************************************************/

#include <stdio.h>
    #include <regex.h>
regex_t regex;
int reti;
char msgbuf[100];

int main()
{
/* Compile regular expression */
    reti = regcomp(&regex, "^duuii", 0);
    if (reti) {
        fprintf(stderr, "Could not compile regex\n");
        exit(1);
    }

/* Execute regular expression */
    reti = regexec(&regex, "dupa8", 0, NULL, 0);
    if (!reti) {
        puts("Match");
    }
    else if (reti == REG_NOMATCH) {
        puts("No match");
    }
    else {
        regerror(reti, &regex, msgbuf, sizeof(msgbuf));
        fprintf(stderr, "Regex match failed: %s\n", msgbuf);
        exit(1);
    }

/* Free memory allocated to the pattern buffer by regcomp() */
    regfree(&regex);

    return 0;
}