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Ios NSRegularExpression崩溃

ios objective-c regex

Ios NSRegularExpression崩溃,ios,objective-c,regex,crash,Ios,Objective C,Regex,Crash,我正在使用NSRegularExpression从HTML中选择图像URL。然而，当我尝试实际使用它时，我得到以下错误： *由于未捕获的异常“NSInvalidArgumentException”而终止应用程序，原因：'*-[NSRegularExpression枚举匹配安装：选项：范围：usingBlock:：nil参数' 我看过其他类似的Stackoverflow答案，但该问题使用了NSMatchingOption，而我没有，答案没有给出我的情况有什么问题的信息 下面是正在崩溃的代码： NS

我正在使用NSRegularExpression从HTML中选择图像URL。然而，当我尝试实际使用它时，我得到以下错误：

*由于未捕获的异常“NSInvalidArgumentException”而终止应用程序，原因：'*-[NSRegularExpression枚举匹配安装：选项：范围：usingBlock:：nil参数'

我看过其他类似的Stackoverflow答案，但该问题使用了NSMatchingOption，而我没有，答案没有给出我的情况有什么问题的信息

下面是正在崩溃的代码：

NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"(<img\\s[\\s\\S]*?src\\s*?=\\s*?['\"](.*?)['\"][\\s\\S]*?>)+?" options:NSRegularExpressionCaseInsensitive error:nil];
NSString *source = [NSString stringWithContentsOfURL:[NSURL URLWithString:object[@"link"]] encoding:NSUTF8StringEncoding error:nil];

NSArray *imageResults = [regex matchesInString:source options:0 range:NSMakeRange(0, source.length)];
NSURL *link = [imageResults.firstObject URL];
UIImage *img = [UIImage imageWithData:[NSData dataWithContentsOfURL:link]];
if (img)
{
    [self.images setObject:img forKey:object[@"link"]];
    dispatch_async(dispatch_get_main_queue(), ^{
        cell.imageView.image = img;
        [cell layoutSubviews];
    });
}

NSRegularExpression*regex=[NSRegularExpression regular expression with pattern:@“（）+？”选项：NSRegularExpression不区分大小写错误：nil]；
NSString*source=[NSString stringWithContentsOfURL:[NSURL URLWithString:object[@“link”]]编码：NSUTF8STRING编码错误：nil]；
NSArray*imageResults=[regex-matchesisnstring:source-options:0-range:NSMakeRange（0，source.length）]；
NSURL*link=[imageResults.firstObject URL]；
UIImage*img=[UIImage-imageWithData:[NSData-dataWithContentsOfURL:link]]；
如果（img）
{
[self.images setObject:img forKey:object[@“link”]；
dispatch\u async（dispatch\u get\u main\u queue（）^{
cell.imageView.image=img；
[单元布局子视图]；
});
}
崩溃本身发生在实例化了
imageResults
的行上

有人知道这段代码有什么问题吗？

有一个问题：
匹配安装：source
返回一个
NSTextCheckingResults
数组

例如，必须添加错误检查：

NSString *regExp = @"<img\\s+src=[\"']([^\"']+)";
NSError *error;
NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:regExp options:NSRegularExpressionCaseInsensitive error:&error];

NSString *source = @"leading<img src=\"news.google.com/news/…\" alt=\"Smiley face\">more";

NSArray *matchResults = [regex matchesInString:source options:0 range:NSMakeRange(0, source.length)];
NSTextCheckingResult *result0 = matchResults[0];
NSRange imgRange = [result0 rangeAtIndex:1];
NSLog(@"imgRange: %@, '%@'", NSStringFromRange(imgRange), [source substringWithRange:imgRange]);

NSString*regExp=@“更多”；
NSArray*matchResults=[regex-matchesInString:source-options:0-range:NSMakeRange（0，source.length）]；
NSTextCheckingResult*result0=匹配结果[0]；
NSRange imgRange=[result0 rangeAtIndex:1]；
NSLog（@“imgRange:%@，%@'，NSStringFromRange（imgRange），[source substringWithRange:imgRange]）；
输出：

imgRange: {18793, 68}, 'http://a.espncdn.com/espncitysites/newyork/prod/assets/sub_ny_r3.png' imgRange: {18793, 68}, 'http://a.espncdn.com/espncitysites/newyork/prod/assets/sub_ny_r3.png' imgRange: {19784, 172}, 'http://ad.Doubleclick.net/ad/espn.local.newyork.com/nba;pgtyp=story;sp=nba;tm=cle;pl=1015;pl=1966;pl=2028618;pl=215;pl=2419;objid=11634537;col=mcmenamin_dave;sz=150x45,1x1;' imgRange: {22162, 182}, 'http://ad.Doubleclick.net/ad/espn.local.newyork.com/nba;pgtyp=story;sp=nba;tm=cle;pl=1015;pl=1966;pl=2028618;pl=215;pl=2419;objid=11634537;col=mcmenamin_dave;sz=1280x946,200x800,1x1;' imgRange: {23470, 186}, 'http://ad.Doubleclick.net/ad/espn.local.newyork.com/nba;pgtyp=story;sp=nba;tm=cle;pl=1015;pl=1966;pl=2028618;pl=215;pl=2419;objid=11634537;col=mcmenamin_dave;sz=728x90,970x66,924x50,1x1;' imgRange: {29706, 36}, 'http://a.espncdn.com/icons/in_15.png' imgRange: {30352, 103}, 'http://a.espncdn.com/media/motion/2014/1003/dm_141003_nba_schwartz_bron/dm_141003_nba_schwartz_bron.jpg' imgRange: {31339, 37}, 'http://a.espncdn.com/icons/video2.png' imgRange: {34098, 65}, 'http://a.espncdn.com/photo/2014/1001/nba_a_lebron01jr_300x300.jpg' imgRange: {35987, 55}, 'http://a.espncdn.com/i/columnists/windhorst_brian_m.jpg' imgRange: {38249, 79}, 'http://a.espncdn.com/combiner/i?img=/photo/2014/0926/nba_a_james_mb_203x114.jpg' imgRange: {41787, 36}, 'http://a.espncdn.com/icons/in_15.png' imgRange: {42698, 87}, 'http://a.espncdn.com/combiner/i?img=%2fi%2fcolumnists%2fmcmenamin_dave_35.jpg&w=35&h=48' imgRange: {48148, 68}, 'http://a.espncdn.com/photo/2014/1002/nba_garnett_wiggins_203x114.jpg' imgRange: {48834, 33}, 'http://a.espncdn.com/icons/in.gif' imgRange: {50157, 181}, 'http://ad.Doubleclick.net/ad/espn.local.newyork.com/nba;pgtyp=story;sp=nba;tm=cle;pl=1015;pl=1966;pl=2028618;pl=215;pl=2419;objid=11634537;col=mcmenamin_dave;sz=300x600,300x250,1x1;' imgRange: {51105, 45}, '/photo/2014/1003/mlb_g_martinez_b1_110x62.jpg' imgRange: {51801, 41}, '/photo/2014/1003/ny_u_geno2_js_110x62.jpg' imgRange: {52491, 43}, '/photo/2014/1002/nhl_g_fleury_b3_110x62.jpg' imgRange: {53201, 44}, '/photo/2014/1002/ny_g_betances_js_110x62.jpg' imgRange: {53902, 42}, '/photo/2014/1003/ny_g_murphy_js_110x62.jpg' imgRange: {54986, 66}, 'http://a.espncdn.com/i/Integrators/shop.lebron.welcome.300x100.jpg' imgRange:{17,22}，'news.google.com/news/…'

请参阅：ICU用户指南

此答案针对上一个答案的评论中提供的问题和URL。它假设有多个图像URL，并且所有URL都是需要的。
注1:html编码为
nsisolatin1stringecoding

注2:RegExp用于处理“src=”的排序

NSString*urString=@”http://news.google.com/news/url?sa=t&fd=R&ct2=us&usg=AFQjCNHVXXEN0DG2pblU2_FBFfeS3klRVw&clid=c3a7d30bb8a4878e06b80cf16b898331&cid=52778623354837&ei=ugAvVMDVIsLGwAHPtYG4CA&url=http://espn.go.com/new-约克/nba/story/uid/11634537/克利夫兰骑士公开赛勒布朗·詹姆斯赛季常规休息”；
NSURL*url=[NSURL URLWithString:urString]；
n错误*错误；
NSString*source=[NSString stringWithContentsOfURL:url编码：NSISOLATIN1STRINGGENCODING错误：&error]；
if（source.length）{
NSString*regExp=@”
输出：

imgRange: {18793, 68},  'http://a.espncdn.com/espncitysites/newyork/prod/assets/sub_ny_r3.png'
imgRange: {18793, 68},  'http://a.espncdn.com/espncitysites/newyork/prod/assets/sub_ny_r3.png'
imgRange: {19784, 172}, 'http://ad.Doubleclick.net/ad/espn.local.newyork.com/nba;pgtyp=story;sp=nba;tm=cle;pl=1015;pl=1966;pl=2028618;pl=215;pl=2419;objid=11634537;col=mcmenamin_dave;sz=150x45,1x1;'
imgRange: {22162, 182}, 'http://ad.Doubleclick.net/ad/espn.local.newyork.com/nba;pgtyp=story;sp=nba;tm=cle;pl=1015;pl=1966;pl=2028618;pl=215;pl=2419;objid=11634537;col=mcmenamin_dave;sz=1280x946,200x800,1x1;'
imgRange: {23470, 186}, 'http://ad.Doubleclick.net/ad/espn.local.newyork.com/nba;pgtyp=story;sp=nba;tm=cle;pl=1015;pl=1966;pl=2028618;pl=215;pl=2419;objid=11634537;col=mcmenamin_dave;sz=728x90,970x66,924x50,1x1;'
imgRange: {29706, 36},  'http://a.espncdn.com/icons/in_15.png'
imgRange: {30352, 103}, 'http://a.espncdn.com/media/motion/2014/1003/dm_141003_nba_schwartz_bron/dm_141003_nba_schwartz_bron.jpg'
imgRange: {31339, 37},  'http://a.espncdn.com/icons/video2.png'
imgRange: {34098, 65},  'http://a.espncdn.com/photo/2014/1001/nba_a_lebron01jr_300x300.jpg'
imgRange: {35987, 55},  'http://a.espncdn.com/i/columnists/windhorst_brian_m.jpg'
imgRange: {38249, 79},  'http://a.espncdn.com/combiner/i?img=/photo/2014/0926/nba_a_james_mb_203x114.jpg'
imgRange: {41787, 36},  'http://a.espncdn.com/icons/in_15.png'
imgRange: {42698, 87},  'http://a.espncdn.com/combiner/i?img=%2fi%2fcolumnists%2fmcmenamin_dave_35.jpg&w=35&h=48'
imgRange: {48148, 68},  'http://a.espncdn.com/photo/2014/1002/nba_garnett_wiggins_203x114.jpg'
imgRange: {48834, 33},  'http://a.espncdn.com/icons/in.gif'
imgRange: {50157, 181}, 'http://ad.Doubleclick.net/ad/espn.local.newyork.com/nba;pgtyp=story;sp=nba;tm=cle;pl=1015;pl=1966;pl=2028618;pl=215;pl=2419;objid=11634537;col=mcmenamin_dave;sz=300x600,300x250,1x1;'
imgRange: {51105, 45},  '/photo/2014/1003/mlb_g_martinez_b1_110x62.jpg'
imgRange: {51801, 41},  '/photo/2014/1003/ny_u_geno2_js_110x62.jpg'
imgRange: {52491, 43},  '/photo/2014/1002/nhl_g_fleury_b3_110x62.jpg'
imgRange: {53201, 44},  '/photo/2014/1002/ny_g_betances_js_110x62.jpg'
imgRange: {53902, 42},  '/photo/2014/1003/ny_g_murphy_js_110x62.jpg'
imgRange: {54986, 66},  'http://a.espncdn.com/i/Integrators/shop.lebron.welcome.300x100.jpg'
伊姆格兰奇：{18793，68}，'http://a.espncdn.com/espncitysites/newyork/prod/assets/sub_ny_r3.png'
伊姆格兰奇：{18793，68}，'http://a.espncdn.com/espncitysites/newyork/prod/assets/sub_ny_r3.png'
伊姆格兰奇：{19784172}，'http://ad.Doubleclick.net/ad/espn.local.newyork.com/nbapgtyp=story；sp=nba；tm=cle；pl=1015；pl=1966；pl=2028618；pl=215；pl=2419；objid=11634537；col=mcmenamin_dave；sz=150x45,1x1；'
伊姆格兰奇：{22162182}，'http://ad.Doubleclick.net/ad/espn.local.newyork.com/nbapgtyp=story；sp=nba；tm=cle；pl=1015；pl=1966；pl=2028618；pl=215；pl=2419；objid=11634537；col=mcmenamin_dave；sz=1280x946200x800,1x1；'
伊姆格兰奇：{23470186}，'http://ad.Doubleclick.net/ad/espn.local.newyork.com/nbapgtyp=story；sp=nba；tm=cle；pl=1015；pl=1966；pl=2028618；pl=215；pl=2419；objid=11634537；col=mcmenamin_dave；sz=728x90970x66924x50,1x1；'
伊姆格兰奇：{29706，36}，'http://a.espncdn.com/icons/in_15.png'
imgRange:{30352103}，'http://a.espncdn.com/media/motion/2014/1003/dm_141003_nba_schwartz_bron/dm_141003_nba_schwartz_bron.jpg'
伊姆格兰奇：{31339，37}，'http://a.espncdn.com/icons/video2.png'
伊姆格兰奇：{3409865}，'http://a.espncdn.com/photo/2014/1001/nba_a_lebron01jr_300x300.jpg'
伊姆格兰奇：{35987，55}，'http://a.espncdn.com/i/columnists/windhorst_brian_m.jpg'
伊姆格兰奇：{38249，79}，'http://a.espncdn.com/combiner/i?img=/photo/2014/0926/nba_a_james_mb_203x114.jpg'
伊姆格兰奇：{41787，36}，'http://a.espncdn.com/icons/in_15.png'
伊姆格兰奇：{42698，87}，'http://a.espncdn.com/combiner/i?img=%2fi%2fcolumnists%2fmcmenamin_dave_35.jpg&w=35&h=48'
伊姆格兰奇：{48148，68}，'http://a.espncdn.com/photo/2014/1002/nba_garnett_wiggins_203x114.jpg'
伊姆格兰奇：{48834，33}，'http://a.espncdn.com/icons/in.gif'
伊姆格兰奇：{50157181}，'http://ad.Doubleclick.net/ad/espn.local.newyork.com/nbapgtyp=story；sp=nba；tm=cle；pl=1015；pl=1966；pl=2028618；pl=215；pl=2419；objid=11634537；col=mcmenamin_dave；sz=300x600300x250,1x1；'
imgRange:{51105,45}，'/photo/2014/1003/mlb_g_martinez_b1_110x62.jpg'
imgRange:{5180141}，'/photo/2014/1003/ny_____geno2_js_110x62.jpg'
imgRange:{5249143}，'/photo/2014/1002/nhl_g_fleury_b3_110x62.jpg'
imgRange:{53201,44}，'/photo/2014/1002/ny_g__betants_js_110x62.jpg'
imgRange:{53902，42}，'/photo/2014/1003/ny_g_murphy_js_110x62.jpg'
伊姆格兰奇：{54986，66}，'http://a.espncdn.com/i/Integrators/shop.lebron.welcome.300x100.jpg'

source
好吗？你检查过了吗，NSLog'ed它了吗？它是零吗？@Zaph
source
对每个URL都是好的。这个URL似乎崩溃了（目前，过去有不同的），是编码不正确，应该是
NSISOLatin1StringEncoding
。从标题：“charset=iso-8859-1“。这就是为什么像Charles Proxy这样的网络分析器invaluable@Zaph是否有办法首先确定编码？是的，请使用Charles并查看显示“Content-type text/html；charset=iso-8859-1”的响应标题。查找iso-8859-1将导致您找到“Latin1String”“然后到
NSString
编码
NSISOLatin1StringEncoding
。请注意，通过添加
error
参数