Position of a Substring in NSString

Question

How I can get the position/Index of a substring within an NSString?

I am finding the location in the following way.

NSRange range = [string rangeOfString:searchKeyword];
NSLog (@"match found at index:%u", range.location);

This returns index:2147483647 when searchKeyword is a substring within string.

How i can get the index value like 20 or 5 like that?

Solution 1

2147483647 is the same thing as NSNotFound, which means the string you searched for (searchKeyword) wasn't found.

NSRange range = [string rangeOfString:searchKeyword];
if (range.location == NSNotFound) {
    NSLog(@"string was not found");
} else {
    NSLog(@"position %lu", (unsigned long)range.location);
}

Solution 2

NSString *searchKeyword = @"your string";

NSRange rangeOfYourString = [string rangeOfString:searchKeyword];

if(rangeOfYourString.location == NSNotFound)
{
     // error condition — the text searchKeyword wasn't in 'string'
}
else{
     NSLog(@"range position %lu", rangeOfYourString.location);
}

NSString *subString = [string substringToIndex:rangeOfYourString.location];

may this will help you....

Comments

[Shaheen Rehman]

thanks -@Kevin Ballard for help. do you help me that how i can select a substring on the bases of that range. e.g. And, of course, it must be asked:is it proper to transact with the Turks for the most reassured of Greek possessions when **Greece* is under Turkish invasion and subjugation?. here i found the location of Greece now i want to select a substring one or two words before and after of that Greece Words. like when Greece is Under Turkish. can you help Please!

[Shaheen Rehman]

thanks -@Kevin Ballard for help. do you help me that how i can select a substring on the bases of that range. e.g. And, of course, it must be asked:is it proper to transact with the Turks for the most reassured of Greek possessions when **Greece* is under Turkish invasion and subjugation?. here i found the location of Greece now i want to select a substring one or two words before and after of that Greece Words. like when Greece is Under Turkish. can you help Please!

[Abhishek]

you can use it.... [string substringToIndex:rangeOfYourString.location]; I am editing in the code... may this will help you

[Lily Ballard]

@ShaheenRehman: You probably want to use the -enumerateSubstringsInRange:options:usingBlock: API. This can give you individual words.

[Shaheen Rehman]

thanks -@Abhishek it work for me [string substringFromIndex:range.location];

[Shaheen Rehman]

-@Kevin Ballard can you give me code example of -enumerateSubstringsInRange:options:usingBlock: API.