CODEWITHSUNDEEP
iosobjective-cnsstring
lukas
lukas

Reputation: 2410

Extract part between two substrings in NSString

I have a NSString and I want to extract a part between two substrings from this string.

Example string: https://itunes.apple.com/de/app/limbo/id656951157?l=en&mt=8

How to get the app id 656951157, which is between id and ??

Upvotes: 0

Views: 203

Answers (3)

Hussain Shabbir
Hussain Shabbir

Reputation: 14995

Try below using regularexpression:-

  NSString *urlString = @"https://itunes.apple.com/de/app/limbo/id656951157?l=en&mt=8";
 NSString *URLRegExPattern = @"(?=id).*(?=//?l=en&mt=8 )";

   NSError *regExErr;

   NSRegularExpression *URLRegEx = 
   [NSRegularExpression 
regularExpressionWithPattern:URLRegExPattern 
                                                                         options:0
                                                                        error:&regExErr];

  NSRange range = [URLRegEx 
  rangeOfFirstMatchInString:urlString
                                        options:0 
                                          range:NSMakeRange(0, urlString.length)];

  if (!NSEqualRanges(range, 
 NSMakeRange(NSNotFound, 0))) {
NSString *appId = [urlString substringWithRange:range];
}

  NSLog(@"appId: %@", appId);:-

Upvotes: 0

Martin R
Martin R

Reputation: 539685

Instead of searching for substrings ("id", "?") you could convert the string to an URL and get its last path component:

NSString *urlString = @"https://itunes.apple.com/de/app/limbo/id656951157?l=en&mt=8";
NSURL *url = [NSURL URLWithString:urlString];
NSString *lastComp = [url lastPathComponent]; // id656951157
if ([lastComp length] >= 3) {
    // Strip initial "id":
    NSString *appId = [lastComp substringFromIndex:2];
    NSLog(@"%@", appId);
    // 656951157
}

Upvotes: 1

Sasi
Sasi

Reputation: 1897

Use component separator [yourString componentsSeparatedByString:@"id"]; which will give you an array with 2 values. Second value will be having 656951157?l=en&mt=8. Again use componentsSeparatedByString with ? to split this string then you can get 656951157.

Upvotes: 0

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