/*1.将可变字符串 @"When I was young, I loved a girl in neighbor class."中,从 young提取到girl。替换 成@"a teacher, I rather to teach student "。*/
#import <Foundation/Foundation.h>int main(int argc, const char * argv[])
{@autoreleasepool {/*方法一*///NSMutableString * str = @"When I was young, I loved a girl in neighbor class.";/*NSMutableString * str1 = [[NSMutableString alloc]initWithString:@"When I was young, I loved a girl in neighbor class."];[str1 replaceCharactersInRange:NSMakeRange(11, 21) withString:@"a teacher, I rather to teach student"];NSLog(@"%@",str1);*//**方法二  先删除 再插入*//*NSMutableString * str1 = [[NSMutableString alloc]initWithString:@"When I was young, I loved a girl in neighbor class."];[str1 deleteCharactersInRange:NSMakeRange(11,22)];//NSLog(@"%@",str1);[str1 insertString:@"a teacher, I rather to teach student" atIndex:11];NSLog(@"%@",str1);*//*方法三*//*NSMutableString * str1 = [[NSMutableString alloc]initWithString:@"When I was young, I loved a girl in neighbor class."];NSString * str2 = [str1 stringByReplacingOccurrencesOfString:@"young, I loved a girl" withString:@"a teacher, I rather to teach student"];NSLog(@"%@",str2);*//*方法四*/NSMutableString * str1 = [[NSMutableString alloc]initWithString:@"When I was young, I loved a girl in neighbor class."];NSMutableString * str2=[str1 stringByReplacingOccurrencesOfString:@"young, I loved a girl" withString:@""];[str2 insertString:@"a teacher, I rather to teach student" atIndex:11];NSLog(@"%@",str2);}return 0;
}