查找string 中>与<之间的字符 string=@"<stu><name>a<b<<<name/>qw<stu/>"

main.m.


#import <Foundation/Foundation.h>
#import "Str.h"
int main (int argc, const char * argv[])
{

    @autoreleasepool {
       
        NSString *string=[NSString stringWithFormat:@"<stu><name>a<b<<<name/>qw<stu/>"];
//        NSString *string=[NSString stringWithFormat:@"<<张三>>5>3<<<<李四>>233<"];
        for (int i=0; i<string.length+12; i++) {
            string=[Str getString:string];
        }
        NSLog(@"%@",string);
 
    }
    return 0;
}


Str.h


#import <Foundation/Foundation.h>

@interface Str : NSObject
+(NSString *)getString:(NSString *)sender;
@end

Str.m



#import "Str.h"

@implementation Str
+(NSString *)getString:(NSString *)string{
    //查找出>与<之间的字符。
    //<stu><name>a<b<name/><stu/>
    //<<张三>>5>3<<李四>>
   

    NSString *str1;
    NSString *str2;
    NSString *str3;
    NSString *str4;
    NSString *str5;
    int m=0,n=0,k=0;
    //思路是<>之间的都去掉。
    m=(int)[string rangeOfString:@"<"].location;
    n=(int)[string rangeOfString:@">"].location;
    NSLog(@"m==%d==",m);
    NSLog(@"n==%d==",n);
    if (m<0) {
        return string;
    }
    if (n<0) {
        return string;
    }
    if (n<m) {
        n=(int)[[string substringFromIndex:n+1] rangeOfString:@">"].location+3;
    }
    if (n>m) {
        str4=[string substringWithRange:NSMakeRange(m, n-m)];
        str5=[string substringWithRange:NSMakeRange(m+1, n-m)];
        if ([str5 rangeOfString:@"<"].length==0) {
            str1=[string substringToIndex:m];
            NSLog(@"str1===%@",str1);
            NSLog(@"str2===%@",str2);
            str2=[string substringFromIndex:n+1];
        }
        else{
            NSLog(@"k==%d==",k);
            k=(int)[str5 rangeOfString:@"<"].location;
            str1=[string substringToIndex:m+k+1];//往后面去。
            NSLog(@"str1===%@",str1);
            NSLog(@"str2===%@",str2);
            str2=[string substringFromIndex:n+1];
        }
      
        str3=[NSString stringWithFormat:@"%@%@",str1,str2];
        return str3;
    }
    return string;
}
@end