ios 查找字符串子串的范围
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find range of substring of string
提问by Teddy13
I am trying to figure out how to get a range of a substring within a string. By range I mean where the substring begins and where it ends. So if I have following string example:
我想弄清楚如何在字符串中获取子字符串的范围。我所说的范围是指子字符串的开始和结束位置。因此，如果我有以下字符串示例：
NSString *testString=@"hello everyone how are you doing today?Thank you!";
If the substring I am looking for (in this example) is "how are you doing", then the beginning range should be 15 and the ending range should 31.
如果我正在寻找的子字符串（在本例中）是“你好吗”，那么开始范围应该是 15，结束范围应该是 31。
(15, 31)
Can anyone tell me how I could do this programatically? Thank you!
谁能告诉我如何以编程方式做到这一点？谢谢！
回答by max_
You can use the method -rangeOfStringto find the location of a substring in a string. You can then compare the location of the range to NSNotFound to see if the string actually does contain the substring.
您可以使用该方法-rangeOfString查找子字符串在字符串中的位置。然后，您可以将范围的位置与 NSNotFound 进行比较，以查看字符串是否确实包含子字符串。
NSRange range = [testString rangeOfString:@"how are you doing"];
if (range.location == NSNotFound) {
NSLog(@"The string (testString) does not contain 'how are you doing' as a substring");
}
else {
NSLog(@"Found the range of the substring at (%d, %d)", range.location, range.location + range.length);
}
回答by Trenskow
It is pretty straight forward. You say you want to search the string "hello everyone how are you doing today?Thank you!" for "how are you doing".
这是非常直接的。您说要搜索字符串“大家好，今天过得好吗？谢谢！” 因为“你好吗”。
You say you need the position of the first character and the last.
你说你需要第一个字符和最后一个字符的位置。
NSString *testString=@"hello everyone how are you doing today?Thank you!";
NSRange range = [testString rangeOfString:@"how are you doing"];
NSUInteger firstCharacterPosition = range.location;
NSUInteger lastCharacterPosition = range.location + range.length;
So now you have it those two last variables.
所以现在你有了最后两个变量。
回答by Tim
Use the built in method part of NSString:
使用 的内置方法部分NSString：
[testString rangeOfString:@"hello how are you doing"]
文档：https : //developer.apple.com/library/mac/documentation/Cocoa/Reference/Foundation/Classes/NSString_Class/Reference/NSString.html#//apple_ref/doc/uid/20000154-rangeOfString_
