如何把一个字符串分割成多个字符串 怎么样把一个字符串分割成单个字符数组
objective-c\u600e\u4e48\u5c06\u4e00\u4e2a\u5b57\u7b26\u4e32\u5206\u5272\u6210\u591a\u4e2a\u5b57\u7b26\u4e32\u53ef\u4ee5\u7528NSString\u7c7b\u7684 - (NSArray *)componentsSeparatedByString:(NSString *)separator\u51fd\u6570\u5b9e\u73b0\u3002
\u4f8b\u5b50\uff1a
\u5047\u5982\u6709\u4e00\u4e2a\u5b57\u7b26\u4e32
NSString *list = @"Karin, Carrie, David";
\u53ef\u4ee5\u7528\u4e0a\u9762\u7684\u51fd\u6570\u5f97\u5230\u4e00\u4e2a\u5b57\u7b26\u4e32\u6570\u7ec4\uff1a
NSArray *listItems = [list componentsSeparatedByString:@", "];
\u8fd9\u4e2a\u6570\u7ec4\u5c31\u662f\u628a\u539f\u6765\u7684\u5b57\u7b26\u4e32\u7528","\u5206\u5272\u5f97\u5230\u7684\u591a\u4e2a\u5b57\u7b26\u4e32\uff1a
{ @"Karin", @"Carrie", @"David"" }
\u4e0b\u9762\u662f\u82f9\u679c\u5b98\u65b9NSString\u7c7b\u7684\u8bf4\u660e\uff1a
\u94fe\u63a5\u5730\u5740\uff1a
https://developer.apple.com/library/mac/documentation/Cocoa/Reference/Foundation/Classes/NSString_Class/index.html#//apple_ref/occ/instm/NSString/componentsSeparatedByString:
Objective-C
- (NSArray *)componentsSeparatedByString:(NSString *)separator
Parameters
separator
The separator string.
Return Value
An NSArray object containing substrings from the receiver that have been divided by separator.
Discussion
The substrings in the array appear in the order they did in the
receiver. Adjacent occurrences of the separator string produce empty
strings in the result. Similarly, if the string begins or ends with the
separator, the first or last substring, respectively, is empty. For
example, this code fragment:
NSString *list = @"Karin, Carrie, David";
NSArray *listItems = [list componentsSeparatedByString:@", "];
produces an array { @"Karin", @"Carrie", @"David"" }.
If list begins with a comma and space\u2014for example, @", Norman, Stanley, Fletcher"\u2014the array has these contents: { @"", @"Norman", @"Stanley", @"Fletcher" }
If list has no separators\u2014for example, "Karin"\u2014the array contains the string itself, in this case { @"Karin" }.
\u4e0d\u9700\u8981\u4e13\u95e8\u5206\u5272\uff0cC\u8bed\u8a00\u91cc\u9762\u672c\u6765\u5c31\u662f\u7528\u5b57\u7b26\u6570\u7ec4\u6765\u4fdd\u5b58\u7684\uff0c\u5982\uff1achar a[20]="Hello world!";\u8fd9\u4e2a\u5b57\u7b26\u4e32\uff0cchar[0]\u5c31\u662fH\uff0cchar[1]\u5c31\u662fe\u3002
\u5982\u679c\u8981\u5206\u5272\u5b50\u4e32\uff0c\u53ef\u4ee5\u4f7f\u7528strtok\u51fd\u6570\u3002
char *strtok(char *s, char *delim);
\u5206\u89e3\u5b57\u7b26\u4e32\u4e3a\u4e00\u7ec4\u5b57\u7b26\u4e32\u3002s\u4e3a\u8981\u5206\u89e3\u7684\u5b57\u7b26\u4e32\uff0cdelim\u4e3a\u5206\u9694\u7b26\u5b57\u7b26\u4e32\u3002
\u9996\u6b21\u8c03\u7528\u65f6\uff0cs\u6307\u5411\u8981\u5206\u89e3\u7684\u5b57\u7b26\u4e32\uff0c\u4e4b\u540e\u518d\u6b21\u8c03\u7528\u8981\u628as\u8bbe\u6210NULL\u3002
strtok\u5728s\u4e2d\u67e5\u627e\u5305\u542b\u5728delim\u4e2d\u7684\u5b57\u7b26\u5e76\u7528NULL('')\u6765\u66ff\u6362\uff0c\u76f4\u5230\u627e\u904d\u6574\u4e2a\u5b57\u7b26\u4e32\u3002
下面两种方法均可以把一个字符串分割成多个字符串
一、Java
知识补充
String的split方法支持正则表达式；
正则表达式\s表示匹配任何空白字符，+表示匹配一次或多次。
- String str = "a b c d e f g"
- String [] arr = str.split("\\s+");for(String ss : arr){
- System.out.println(ss);
- }
有了以上补充知识，下面的内容就很好理解了。
一、待分割字符串
待分割字符串为如下：
其中，字符串中的的空白分别为：单个空格，多个空格，tab制表符。
二、使用一个或多个空格分割字符串
正确代码如下：
编写的程序
public static void main(String args[]) {
String line = "good12 morning34 good56 night78";
//对String进行split之后的数组的输出
String[] tt=line.split("\\s+");
for(String s:tt)
{
System.out.println(s);
}
System.out.println("#####");
}
输出结果为
good12
morning34
good56
night78
二、C语言
#include <stdio.h>
#include <conio.h>
#define MAX_X 20
#define MAX_Y 10
#define DIV_CHAR ' ' /*separator*/
void divString(char* string,char buffer[MAX_X][MAX_Y],int* pCount)
{
char* pChar;
int x,y;
for(pChar=string,x=0; x<MAX_X && *pChar; x++,(*pCount)++)
for(y=0; y<MAX_Y && *pChar; y++,pChar++)
{
if(DIV_CHAR == *pChar)
{
buffer[x][y] = '\0';
pChar ++;
break;
}
buffer[x][y] = *pChar;
}
buffer[*pCount-1][y] = '\0';
}
void main()
{
char string[100],buffer[MAX_X][MAX_Y];
int x,count = 0;
printf("Please enter one string:");
gets(string);
divString(string,buffer,&count);
printf("Before division:");
puts(string);
printf("After division:
");
for(x=0; x<count; x++)
puts(buffer[x]);
getch();
}
这个问题要具体问题具体分析吧！
比如说C#，有一个字符串str=“123.456.789”
str.Split('.').ToArray();这样就分割开了。
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