sscanf扣取字符串的常用用法

sscanf扣取字符串的常用用法_第1张图片
#define _CRT_SECURE_NO_WARNINGS
#include 
#include
#include 
void test1()//sscanf匹配整个字符串
{
	const char *str = "asdasdadsad";
	char buf[1024] = { 0 };
	sscanf(str, "%s", buf);
	printf("%s\n", buf);
}
void test2()
{
	//sscnaf匹配字符串的时候,遇到空格 \t(tab键)就会停止匹配
	const char *str = "hello world!";
	char buf[1024] = { 0 };
	sscanf(str, "%s", buf);
	printf("buf:%s\n", buf);//输出hello
}
void test3()  //利用[ ]匹配取出字符串或数字
{
	const char *str = "avdd1234Adfsdfs";
	char buf[1024] = { 0 };
	sscanf(str, "%[a-z]", buf);
	printf("%s\n", buf);  //输出avdd

	memset(buf, 0, 1024);
	sscanf(str, "%[a-z0-9]", buf);//匹配所有第一个开始是a-z0-9的字符串
	printf("%s\n", buf);  //输出avdd1234  遇到大写就不匹配了



	const char *str1 = "1123sSasds";   //可以把字符串中的数字取出存入int型变量中
	char buf1[1024] = { 0 };
	int num;
	sscanf(str1, "%d", &num);//匹配数字  输出1123
	printf("%d\n", num);
	sscanf(str1, "%d%s", &num, buf);
	printf("%d     %s\n", num, buf);


	//const char *ip = "127.0.0.1"; //localhost
	//int num1, num2, num3, num4;
	//sscanf(ip, "%d.%d.%d.%d", &num1, &num2, &num3, &num4);
	//printf("num1:%d\n", num1);   //127	
	//printf("num2:%d\n", num2);   //0
	//printf("num3:%d\n", num3);  // 0
	//printf("num4:%d\n", num4);  // 1

}

void test4()
{
	const char *str = "1QQQ234heQQQQlloworld!";
	char buf[1024] = { 0 };
	sscanf(str, "%[1Q]", buf);  //  取出只有1Q
	printf("buf:%s\n", buf);//输出1QQQ
}



//%[^a]  只要不是a就匹配 %[^a-z]
void test5()
{
	const char *str = "WERu123bcd56aplk87";
	char buf[1024] = { 0 };
	sscanf(str, "%[^a]", buf);
	printf("buf:%s\n", buf); //匹配到第一是a的字符就停止   输出WERu123bcd56
	sscanf(str, "%[^a-z]", buf);//匹配到第一个是a-z的字符就停止   输出WER
	printf("buf:%s\n", buf);
}

//%*s 跳过一个字符串或%*d跳过数字
void test6()
{
	{
		const char *str = "abcd   asdasd 1234";
		char buf[1024] = { 0 };
		//跳过字符串 遇到空格%*s就结束了,然后匹配%s  asdasd 遇到空格结束
		sscanf(str, "%*s%s", buf);//输出asdasd  
		printf("buf:%s\n", buf);
	}

	{
		const char *str = "abcd1234";
		char buf[1024] = { 0 };
		int num;
		sscanf(str, "%*[a-z]%s", buf);//跳过所有a-z的字符  然后%s匹配所有字符串
		printf("buf:%s\n", buf); //输出字符串1234

		sscanf(str, "%*[a-z]%d", &num);
		printf("%d\n", num); //输出int类型1234   
	}


	{
		const char *str = "1234abcd";
		char buf[1024] = { 0 };
		sscanf(str, "%*[0-9]%s", buf);
		printf("buf:%s\n", buf);//输出abcd
	}

	{
		const char *str = "hello";
		char buf[1024] = { 0 };
		sscanf(str, "%3s", buf);
		printf("buf:%s\n", buf);//输出hel
	}
}
//hello$1234567!opjhn 匹配$和!之间字符串
void test7()
{
	char *str = "hello$1234567!opjhn";
	char buf[1024] = { 0 };
	sscanf(str, "%*[^$]$%[^!]", buf);//*先跳过所有非$的字符,然后匹配& ,取出&后面所有非!的字符
	printf("%s\n", buf);//输出为1234567

	int num = 0;
	sscanf(str, "%*[^$]$%d", &num);
	printf("%d\n", num);//输出为1234567

}

//1.已给定字符串为: [email protected], 请编码实现helloworld输出和itcast.cn输出。.
void test8()
{
	char *str = "[email protected]";
	char buf1[1024] = { 0 };
	char buf2[1024] = { 0 };
	sscanf(str, "%[^@]@%s", buf1, buf2);
	printf("%s  %s\n", buf1, buf2);
}
//2.已给定字符串为:123abcd$myname@000qwe.请编码实现匹配出myname字符串,并输出.
void test9()
{
	char *str = "123abcd$myname@000qwe";
	char buf[1024] = { 0 };
	sscanf(str, "%*[^$]$%[^@]", buf);
	printf("%s\n", buf);
}


void main()
{
	test1();
	test2();
	test3();
	test4();
	test5();
	test6();
	test7();
	test8();
	test9();
	system("pause");
}

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