字符串的大小比较
NSString *string1 = @"abc";
NSString *string2 = @"bcd"
NSComparisonResult compareResult = [string1 compare:string2];
if (compareResult<0) {
NSLog(@" %@<%@",string1,string2);
}else if(compareResult>0){
NSLog(@" %@>%@",string1,string2);
}else{
NSLog(@" %@=%@",string1,string2);
}
重索引值为1的位置开始截取子串(包含1的位置),一直截到最后
NSString *substring =[@"abcdefg" substringFromIndex:1];
NSLog(@"%@",substring);
字符串拼接
//在原有的字符串后面追加一个字符串
NSString *appendString = [@"abc"stringByAppendingString:@"def"];
NSLog(@"%@",appendString);
//在原有的字符串后面追加一个格式化字符串
NSString *appendString1 = [@"abc"stringByAppendingFormat:@"%d",123];
NSLog(@"%@",appendString1);
字符串替换
NSString *contentString = @"hi,dsb";
NSString *replaceString = [contentString stringByReplacingOccurrencesOfString:@"sb" withString:@"*****"];
NSLog(@"%@",replaceString);
判断一个字符串是否以http开头,以png结尾,如果是,输出是一个有效链接,如果不是,输出链接错误。
NSString *picURLString = @"http://www.lanou3g.com/icon.png";
if ([picURLString hasPrefix:@"http" ] && [picURLString hasSuffix:@"png" ]) {
NSLog(@"有效链接picURLString:%@",picURLString);
}else{
NSLog(@"链接错误");
}
判断一个字符串是否是手机号(特点:11位数字,以13或14或15或17或18开头)
NSString *s = @"182123423454";
if ( (s.length ==11) &&([s hasPrefix:@"13"] ||[s hasPrefix:@"14"]||[s hasPrefix:@"15"]||[s hasPrefix:@"17"]||[s hasPrefix:@"18"])) {
NSLog(@"%@这个字符串是手机号",s);
}else{
NSLog(@"%@这个字符串不是手机号",s);
}
NSString *htmlString = @“<html><head><title>震惊,深夜温强竟然做出这种事</title></head><body><p>从前有座山,山里有座庙,庙里有个老温强和一个小温强,老温强对小温强说:\”嘿嘿嘿"</p></body></html>";
要求:1.将上面这个字符串中的<title></title>中间的内容作为一个新的字符串提取出来
2.将上面这个字符串中的<p></p>中间的内容作为一个新的字符串提取出来
注意:<title></title>和<p></p>假设位置不固定,不要人为的查位置截取
NSString *htmlString = @"<html><head><title>震惊,深夜温强竟然做出这种事</title></head><body><p>从前有座山,山里有座庙,庙里有个老温强和一个小温强,老温强对小温强说:\"嘿嘿嘿\"</p></body></html>";
NSRange range1 =[htmlString rangeOfString:@"<title>"];
NSRange range2 =[htmlString rangeOfString:@"</title>"];
NSString * ss= [htmlString substringWithRange:NSMakeRange(range1.location+7, range2.location-range1.location-7)];
NSLog(@"%@\n",ss);
NSRange range3 =[htmlString rangeOfString:@"<p>"];
NSRange range4 =[htmlString rangeOfString:@"</p>"];
NSString * ss1= [htmlString substringWithRange:NSMakeRange(range3.location+3, range4.location-range3.location-3)];
NSLog(@"%@\n",ss1);
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