如何解决Cannot open include file: 'regex.h': No such file or directory

网上找的一节代码，原来的头文件是：

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

我改为下面，还是不能通过编译，代码未改．谢谢！

#include "stdafx.h"
#include "stdio.h"
#include "regex.h"

int main()
{
regex_t r;
regmatch_t match;
char * s="aaaabbbccc", *t=s;
char * replace="1";
char result[100];//must big enough
size_t pos=0,len=strlen(replace);

memset(result,0,100);
regcomp(&r,"a+",REG_EXTENDED);
while(regexec(&r,t,1,&match,0)==0)
{
printf("start:%lld,end:%lld\n",t-s+match.rm_so,t-s+match.rm_eo);//absolute position in string s
memcpy(result+pos,t,match.rm_so);//first copy the string that doesn't match
pos+=match.rm_so;//change pos
memcpy(result+pos,replace,len);//then replace
pos+=len;

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