How to use PCRE in C for multiple matches

问题

I am trying to use C's PCRE library to then use regex for matching multiple links to USA Senator's from the webpage.

So to do this I need the regex to be able to return 100 matches for me so I can then print out the web addresses to the emails.

From my research, it looks like the PCRE library is going to be the way to do this but I don't know how to get multiple matches from a string.

This is the regex pattern that I am going to be using

Contact:\s+<a\s+(?:[^>]*?\s+)?href=(["'])(.*?)\1

Here is my current code that I am going to be working with

#include <stdio.h>
#include <stddef.h>
#include <stdlib.h>
#include <unistd.h>
#include <pcre.h>

int main() {


    // initiate all used Variables
    FILE *file;
    char *buffer;
    long size;

    //Wget on Senate webpage
    system("wget -q http://www.senate.gov/general/contact_information/senators_cfm.cfm");


    // Attempt to open file
    file = fopen("senators_cfm.cfm", "r");

    if(file == NULL){

        printf("Was unable to open file \n");
        return 1;        

    }

    //Attempt to read to end of file
    fseek(file, 0L, SEEK_END);



    //Determine the number of bytes that were in the file
    size = ftell(file);

    //Attempt to allocate the number of bytes needed
    buffer = (char*) calloc(size, sizeof(char));    
    if(buffer == NULL){

        printf("Unable to allocate memory needed \n");
        return 1;
    }


    //Reset the reader to start of file
    rewind(file);


    //Read whole file into buffer
    fread(buffer, sizeof(char), size, file);


    //Close file
    fclose(file);


    //Free all information that we allocated memory for
    free(buffer);

    unlink("senators_cfm.cfm");
    return 0;
}

来源：https://stackoverflow.com/questions/57859449/how-to-use-pcre-in-c-for-multiple-matches