linux pcre是否安装

dpkg -l | grep libpcre # 对于基于Debian的系统（如Ubuntu）
rpm -qa | grep pcre   # 对于基于Red Hat的系统（如CentOS）

sudo apt-get update
sudo apt-get install libpcre3 libpcre3-dev

sudo yum install pcre pcre-devel

#include <stdio.h>
#include <pcre.h>

int main() {
    const char *error;
    int erroffset;
    const char *pattern = "\\b\\w+\\b"; // 匹配单词
    const char *subject = "Hello world!";

    pcre *re = pcre_compile(pattern, 0, &error, &erroffset, NULL);
    if (re == NULL) {
        printf("PCRE compilation failed at offset %d: %s\n", erroffset, error);
        return 1;
    }

    int ovector[30];
    int rc = pcre_exec(re, NULL, subject, strlen(subject), 0, 0, ovector, 30);
    if (rc < 0) {
        if (rc == PCRE_ERROR_NOMATCH) printf("No match found.\n");
        else printf("Matching error %d\n", rc);
        pcre_free(re);
        return 1;
    }

    for (int i = 0; i < rc; i++) {
        char *substring_start = subject + ovector[2*i];
        int substring_length = ovector[2*i+1] - ovector[2*i];
        printf("%.*s\n", substring_length, substring_start);
    }

    pcre_free(re);
    return 0;
}

gcc -o pcre_example pcre_example.c -lpcre
./pcre_example