pcre_exec函数实例

在研究zabbix的 监控项类型时，看到snmptrap方式，在了解功能实现过程中，顺便找了个有关正则的实例程序跑了一下，做个笔记。

#define PCRE_STATIC // 静态库编译选项  
#include <stdio.h>  
#include <string.h>  
#include <pcre.h>  
#define OVECCOUNT 30 /* should be a multiple of 3 */  
#define EBUFLEN 128  
#define BUFLEN 1024  
  
int main()  
{  
    pcre  *re;  
    const char *error;  
    int  erroffset;  
    int  ovector[OVECCOUNT];  
    int  rc, i;  
    char  src [] = "555 <title>I am OK</title> 666";
    char  pattern [] = "<title>(.*)</(tit)le>";
    printf("String : %s\n", src);  
    printf("Pattern: \"%s\"\n", pattern);  
    re = pcre_compile(pattern,
                      0,
                      &error,
                      &erroffset, 
                      NULL);

    if (re == NULL) { 
        printf("PCRE compilation failed at offset %d: %s\n", erroffset, error);  
        return 1;  
    }  
    rc = pcre_exec(re,
                   NULL,
                   src,
                   strlen(src), 
                   0,
                   0,
                   ovector,
                   OVECCOUNT);    

    if (rc < 0) {                   
        if (rc == PCRE_ERROR_NOMATCH) printf("Sorry, no match ...\n");  
        else printf("Matching error %d\n", rc);  
        pcre_free(re);  
        return 1;  
    }  

    printf("OK, has matched ...\n"); 

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

    pcre_free(re);

    return 0;  
}  

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