Question

可能重复：
  retrieving the substring based on condition from a string in iphone
  Identifying the string in between two strings in iphone

我是iphone的新手。我有一点疑问，就是我有很多字符串（接近66），比如格式为href =“/ mp3 / KJV / 21_Ecc / Ecc_KJV.zip”在单个字符串中，但所有这些字符串的不同之处在于更改名称Ecc的地方但是所有都是相同的格式。所以，我的请求是如何使用正则表达式获取所有以（href =“）开头并以（.zip）结尾的字符串以及如何为其编写正则表达式上面的格式字符串，用于标识该格式的所有字符串。

Answer 1

请试试这个。希望这可以帮到你。感谢

NSString * param = nil;

NSString * objString = [[NSString alloc] initWithString：@“href = \”/ mp3 / KJV / 21_Ecc / Ecc_KJV.zip \“”];

NSRange start = [objString rangeOfString:@"href="];
if (start.location != NSNotFound)
{
    param = [objString substringFromIndex:start.location + start.length];
    NSRange end = [param rangeOfString:@".zip"];
    if (end.location != NSNotFound)
    {
        param = [objString substringToIndex:end.location];
    }
}
NSLog(@"Substring==%@",param);

//param now contains your value (or nil if not found)

Answer 2

NSString *sourceString = ...// your string for search substrings

NSString *pattern = @"href=(.*?).zip";
NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:pattern options:0 error:nil];    
NSArray *results = [regex matchesInString:sourceString options:0 range:NSMakeRange(0, [sourceString length])];
for (NSTextCheckingResult* result in results)
{
    NSString *resultString = [sourceString substringWithRange:result.range];
    NSLog(@"%@",resultString);
}

如何使用正则表达式获取字符串中的子字符串

2 个答案: