Question

嗨，我有一个新闻阅读器，我不断收到这样的字符串 -

two New York police officers shot dead in 'ambush'

I want the string two New York police officers shot dead in ambush

我如何从＆amp;至 ;然后删除扫描的出现次数。

我创建了一个像这样的扫描仪 -

NSString *webString222222 = filteredTitle2;
        NSScanner *stringScanner222222 = [NSScanner scannerWithString:webString222222];
        NSString *content222222 = [[NSString alloc] init];
        [stringScanner222222 scanUpToString:@"&" intoString:Nil];
        [stringScanner222222 scanUpToString:@";" intoString:&content222222];
        NSString *filteredTitle222 = [content222222 stringByReplacingOccurrencesOfString:content222222 withString:@""];
        NSString *filteredTitle22 = [filteredTitle222 stringByReplacingOccurrencesOfString:@"&" withString:@""];

但是当我执行此代码时，整个文本消失了！每一个字。当我检查我的NSLog中的标题是唯一的＆amp;签到那里和唯一的;在那里签到！我不知道我在哪里出错了。

Answer 1

如果您遇到的特殊字符都相对一致，您只需用空字符串替换每个子字符串，如下所示：

NSString *cleansedString = [filteredTitle2 stringByReplacingOccurrencesOfString:@"&#039;" 
                                                                     withString:@""];

Answer 2

您可以使用NSRegularExpression构建正确的匹配模式：

NSString *pattern = @"\\&#[0-9]+;";
NSString *str = @"two New York police officers shot dead in &#039;ambush&#039;";

NSLog(@"Original test: %@",str);
NSError *error = nil;
NSRegularExpression *regex = [NSRegularExpression
                              regularExpressionWithPattern:pattern
                              options:NSRegularExpressionCaseInsensitive error:&error];
if (error != nil)
{
    NSLog(@"ERror: %@",error);
} 
else 
{
    NSString *replaced = [regex stringByReplacingMatchesInString:str
                                                         options:0
                                                           range:NSMakeRange(0, [str length])
                                                    withTemplate:@""];

    NSLog(@"Replaced test: %@",replaced);
}

请参阅https://developer.apple.com/library/ios/documentation/Foundation/Reference/NSRegularExpression_Class/index.html

我想从字符串中删除静态文本 - iOS

2 个答案: