正则匹配

#include <iostream>
using namespace std;

bool check(const char* s, const char* p)
{
    if(*p==0) return 0==*s;
    if(*(p+1)!='+')
    {
        if(*p==*s || (*p=='.' && *s!=0))
        {
            return check(s+1,p+1);
        }
        return false;
    }
    else
    {
        while(*p==*s || (*p=='.' && *s!=0))
        {
            if(check(s,p+2))
            {
                return true;
            }
            s++;
        }
        return check(s,p+2);
    }
}


int main()
{
    const char* pattern = "a+.+b";
    const char* str = "aaaab";
    cout<<check(str,pattern)<<endl;
    return 0;
}