正则表达式提取两个字符或标签之间的所有子字符串 [英] regex to extract all the substrings between two characters or tags

问题描述

我需要提取由两个字符(或者可能是两个标签)包围的所有字符串

I need to extract all the strings surrounded by two characters (or maybe two tags)

这是我到目前为止所做的:

this is what I've done so far:

    NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"\\[(.*?)\\]" options:NSRegularExpressionCaseInsensitive error:NULL];

    NSArray *myArray = [regex matchesInString:@"[db1]+[db2]+[db3]" options:0 range:NSMakeRange(0, [@"[db1]+[db2]+[db3]" length])] ;

    NSLog(@"%@",[myArray objectAtIndex:0]);
    NSLog(@"%@",[myArray objectAtIndex:1]);
    NSLog(@"%@",[myArray objectAtIndex:2]);

在 myArray 中有正确的三个对象，但 NSlog 打印:

In myArray there are correctly three objects but NSlog prints this:

<NSSimpleRegularExpressionCheckingResult: 0x926ec30>{0, 5}{<NSRegularExpression: 0x926e660> \[(.*?)\] 0x1}
<NSSimpleRegularExpressionCheckingResult: 0x926eb30>{6, 5}{<NSRegularExpression: 0x926e660> \[(.*?)\] 0x1}
<NSSimpleRegularExpressionCheckingResult: 0x926eb50>{12, 5}{<NSRegularExpression: 0x926e660> \[(.*?)\] 0x1}

代替 db1、db2 和 db3

instead of db1, db2 and db3

我错在哪里?

推荐答案

根据文档 matchesInString:options:range: 返回一个数组 NSTextCheckingResults 不是 NSStrings.您需要遍历结果并使用范围来获取子字符串.

According to the documentation matchesInString:options:range: returns an array of NSTextCheckingResults not NSStrings. You will need to loop over the results and use the ranges to get the substrings.

NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"\\[(.*?)\\]" options:NSRegularExpressionCaseInsensitive error:NULL];

NSString *input = @"[db1]+[db2]+[db3]";
NSArray *myArray = [regex matchesInString:input options:0 range:NSMakeRange(0, [input length])] ;

NSMutableArray *matches = [NSMutableArray arrayWithCapacity:[myArray count]];

for (NSTextCheckingResult *match in myArray) {
     NSRange matchRange = [match rangeAtIndex:1];
     [matches addObject:[input substringWithRange:matchRange]];
     NSLog(@"%@", [matches lastObject]);
}

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