#include <stdio.h>
#include <regex.h>

#define MAX_MATCHES 10

void extract_numbers(const char *text) {
    regex_t regex;
    regmatch_t matches[MAX_MATCHES];
    const char *pattern = "[0-9]+";
    int ret;

    ret = regcomp(&regex, pattern, REG_EXTENDED);
    if (ret != 0) {
        char error_message[100];
        regerror(ret, &regex, error_message, sizeof(error_message));
        printf("Regex compilation error: %s\n", error_message);
        return;
    }

    while (1) {
        ret = regexec(&regex, text, MAX_MATCHES, matches, 0);
        if (ret != 0) {
            break;
        }

        for (int i = 0; i < MAX_MATCHES && matches[i].rm_so != -1; i++) {
            int start = matches[i].rm_so;
            int end = matches[i].rm_eo;
            printf("Match found: %.*s\n", end - start, text + start);
        }

        printf("%s\n", text);
        text += matches[0].rm_eo;
    }

    regfree(&regex);
}

int main() {
    const char *text = "abc123xyz456";
    extract_numbers(text);

    return 0;
}