如何使用NSRegularExpression或Objective-C中的任何其他有效方式来检查GUID(或UUID)的有效性 [英] How to check the validity of a GUID (or UUID) using NSRegularExpression or any other effective way in Objective-C

问题描述

如果NSString类似于@"{A5B8A206-E14D-429B-BEB0-2DD0575F3BC0}"，则该方法应返回TRUE，而对于@@"bla bla bla"这样的NSString则返回FALSE.

The method should return TRUE if the NSString is something like @"{A5B8A206-E14D-429B-BEB0-2DD0575F3BC0}" and FALSE for a NSString like @"bla bla bla"

我正在使用类似的东西:

I am using something like:

- (BOOL)isValidGUID {

    NSError *error;

    NSRange range = [[NSRegularExpression regularExpressionWithPattern:@"(?:(\\()|(\\{))?\\b[A-F0-9]{8}(?:-[A-F0-9]{4}){3}-[A-Z0-9]{12}\\b(?(1)\\))(?(2)\\})" options:NSRegularExpressionCaseInsensitive error:&error] rangeOfFirstMatchInString:self.GUID options:0 range:NSMakeRange(0, [self.GUID length])];

    if (self.GUID && range.location != NSNotFound && [self.GUID length] == 38) {

        return TRUE;

    } else {

        return NO;
    }
}

但是它没有按我预期的那样工作.

but it is not working as I have expected.

重要:我正在使用的GUID用大括号括起来，例如:{A5B8A206-E14D-429B-BEB0-2DD0575F3BC0}

Important: GUID which I am using is enclosed by curly braces like this: {A5B8A206-E14D-429B-BEB0-2DD0575F3BC0}

推荐答案

此正则表达式与我匹配

\A\{[A-F0-9]{8}-[A-F0-9]{4}-[A-F0-9]{4}-[A-F0-9]{4}-[A-F0-9]{12}\}\Z

简而言之:

• \A和\Z是字符串的开头和结尾
• \{和\}被逃脱了卷曲的bracets
• [A-F0-9]{8}正好是0、1、2、3、4、5、6、7、8、9，A，B，C，D，E，F的8个字符

• \A and \Z is the beginning and end of the string
• \{ and \} is escaped curly bracets
• [A-F0-9]{8} is exactly 8 characters of either 0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,F

作为NSRegularExpression，它看起来像这样

As an NSRegularExpression it would look like this

NSError *error = NULL;
NSRegularExpression *regex = 
  [NSRegularExpression regularExpressionWithPattern:@"\\A\\{[A-F0-9]{8}-[A-F0-9]{4}-[A-F0-9]{4}-[A-F0-9]{4}-[A-F0-9]{12}\\}\\Z" 
                                            options:NSRegularExpressionAnchorsMatchLines 
                                              error:&error];
// use the regex to match the string ...

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