获取子指数 [英] Get index of substring

问题描述

我的的char *源，我想从中提取subsrting，我知道是从符号ABC开始，结束其中source结束。随着的strstr 我能得到poiner，但没有位置，没有位置，我不知道该串的长度。我怎样才能获得字符串的索引纯C？

I have char * source, and I want extract from it subsrting, that I know is beginning from symbols "abc", and ends where source ends. With strstr I can get the poiner, but not the position, and without position I don't know the length of the substring. How can I get the index of the substring in pure C?

推荐答案

使用指针减法。

char *str = "sdfadabcGGGGGGGGG";
char *result = strstr(str, "abc");
int position = result - str;
int substringLength = strlen(str) - position;

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