全世界都知道正则的 (XXX) 是捕获, (?:XXX) 是匹配但不捕获,但OC中是几个意思? 真是不吐不爽!

int main(int argc, const char * argv[]) {
    const char *text =
    "abcdefg12345\n"
    "abcdefg12345\n"
    "ABCDEFG12345\n"
    "abcdefg12345\n"
    "abcdefg12345\n";
    
    NSString *string = @(text);
    
    
    NSError* error = nil;
    NSRegularExpression *reg = [NSRegularExpression regularExpressionWithPattern:@"(?:\\D+)(\\d+)(?:\\D)" options:0 error:&error];
    
    NSArray* match = [reg matchesInString:string options:0 range:NSMakeRange(0, string.length)];
    
    for (NSTextCheckingResult *result in match)
    {
        NSString *str = [string substringWithRange:result.range];
        NSLog(@"result: %@", str);
    }
    
    return 0;
}

输出结果:

             result: abcdefg12345
             result: abcdefg12345
             result: abcdefg12345
             result: abcdefg12345
             result: abcdefg12345

PS:

//问题延伸
NSString *path = @"/Users/sma11case/aaaa/cccc";
NSString *exp = @"(?:/)([^/]+)(?:/[^/]+)$"; // 本来不管是否贪婪都可以安全匹配到aaaa,现在变成要看脸色了