Question

我在解析器中使用正则表达式，但是，它似乎给出了一个结果，这是我的代码：正则表达式：

self.seatSelectRegex = [NSRegularExpression regularExpressionWithPattern:@"Seat ([0-9]{1,2}): (.*) \\([$£€]?([0-9.]+) in chips\\).*$" options:NSRegularExpressionAnchorsMatchLines error:&error];

代码：

NSMutableDictionary *players = [[NSMutableDictionary alloc] init];
[self.seatSelectRegex enumerateMatchesInString:input options:NSMatchingCompleted range:NSMakeRange(0, input.length) usingBlock:
 ^(NSTextCheckingResult *result, NSMatchingFlags flags, BOOL *stop) 
{

    NSLog(@"%lu", result.range.length);
    Player *p = [[Player alloc] init];

    p.name = [input substringWithRange:[result rangeAtIndex:2]];
    p.seatNumber = [input substringWithRange:[result rangeAtIndex:1]].intValue;
    p.stack = [input substringWithRange:[result rangeAtIndex:3]].doubleValue;

    [players setValue:p forKey:p.name];
}];

我期待我的输入有3个结果，但是，我得到4，其中最后一个结果的范围是location = 0和length = 0（前三个都是正确的）。这是常见的行为吗？我应该检查范围的位置和长度，还是某处出现错误？

对于它的价值，这是我的意见：

PokerStars Hand #81669312371:  Hold'em No Limit ($0.01/$0.02 USD) - 2012/06/08 16:57:33 CET [2012/06/08 10:57:33 ET]
Table 'Icarus III' 6-max Seat #2 is the button
Seat 2: SanderDecler ($2 in chips) 
Seat 3: ehrli87 ($0.90 in chips) 
Seat 4: umar.11 ($1.60 in chips) 
ehrli87: posts small blind $0.01
umar.11: posts big blind $0.02
*** HOLE CARDS ***
Dealt to SanderDecler [Kh 7d]
SanderDecler: raises $0.04 to $0.06
ehrli87: folds 
umar.11: calls $0.04
*** FLOP *** [Jc Tc Jh]
umar.11: checks 
SanderDecler: bets $0.08
umar.11: raises $0.24 to $0.32
SanderDecler: folds 
Uncalled bet ($0.24) returned to umar.11
umar.11 collected $0.28 from pot
*** SUMMARY ***
Total pot $0.29 | Rake $0.01 
Board [Jc Tc Jh]
Seat 2: SanderDecler (button) folded on the Flop
Seat 3: ehrli87 (small blind) folded before Flop
Seat 4: umar.11 (big blind) collected ($0.28)

Answer 1

这是因为您使用NSMatchingReportCompletion选项enumerateMatchesInString:options:range:usingBlock:。来自Apples documentation：

如果指定了NSMatchingReportCompletion匹配选项，匹配完成后将调用一次Block对象，结果为nil，并且在传递给Block的标志中设置NSMatchingCompleted匹配标志，加上任何其他相关的“NSMatchingFlags” NSMatchingHitEnd，NSMatchingRequiredEnd或NSMatchingInternalError。

您将最后一个块调用视为位置和长度设置为0的范围的原因是因为您向nil发送的消息将返回nil（整数为0）。

NSRegularExpression enumerateMatchesInString：options：range：usingBlock：给出null结果？

1 个答案: