C预处理器宏中的正则表达式

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

#define REGEX_MATCH(pattern, string) ({ \
    int result = 0; \
    regex_t regex; \
    if (regcomp(&regex, pattern, REG_EXTENDED|REG_NOSUB) == 0) { \
        result = regexec(&regex, string, 0, NULL, 0) == 0; \
        regfree(&regex); \
    } \
    result; \
})

int main() {
    const char* pattern = "hello.*";
    const char* string = "hello world";

    if (REGEX_MATCH(pattern, string)) {
        printf("The string matches the pattern.\n");
    } else {
        printf("The string does not match the pattern.\n");
    }

    return 0;
}