【C語言】字符串匹配

一、實現功能：

若輸入字符串： What would you recommend to others?

    I am a student.

            Somewould like that to change.

      尋找目標字符串：oul，若含有目標字符串，則將其進行拷貝輸出

二、代碼：

#include <stdio.h>
#include <assert.h>
#include <string.h>
#define MAX 1000						//輸入字符串長度
//輸入字符串函數
int getline(char line[], int max)			
{
	int ch;
	int i = 0;
	while (max > 0 &&
		(ch = getchar()) != EOF && ch != '\n')
	{
		line[i] = ch;
		i++;
		max--;
	}
	if (ch == '\n')
		line[i++] = '\n';
	line[i] = '\0';
	if (i > 0)
		return 1;
	else
		return 0;
}
//匹配字符串
int match(char line[], char *mat)
{
	assert(line);						//斷言
	assert(mat);				
	int i = 0, j = 0, k = 0;
	for (i = 0; i < strlen(line); i++)
	{
		for (k = i, j = 0; j < strlen(mat); j++, k++)
		{
			if (line[k] != *(mat + j))
				break;
		}
		if (*(mat + j) == '\0' && k>0)
			return 1;
	}
	return 0;
}
int main()
{
	char line[MAX];
	char *mat = "oul";
	while (getline(line, MAX))
	{
		if (match(line, mat))
			printf("%s", line);
	}
	return 0;
}

注意：在匹配時，要考慮到字符串中含有oooul的情況

三、運行結果：

Some would like that to change