如何在宏中执行正则表达式？

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

#define MATCH_REGEX(pattern, string) \
    do { \
        regex_t regex; \
        int ret; \
        ret = regcomp(&regex, pattern, REG_EXTENDED); \
        if (ret) { \
            fprintf(stderr, "Failed to compile regex\n"); \
            break; \
        } \
        ret = regexec(&regex, string, 0, NULL, 0); \
        if (!ret) { \
            printf("Matched\n"); \
        } else if (ret == REG_NOMATCH) { \
            printf("Not matched\n"); \
        } else { \
            fprintf(stderr, "Failed to execute regex\n"); \
        } \
        regfree(&regex); \
    } while (0)

int main() {
    char string[] = "Hello, World!";
    MATCH_REGEX("Hello", string);
    return 0;
}