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iOS / iPhone: Extract groups from a Regular Expression (NSRegularExpression)

/ Published in: Objective C
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Extract groups from a Regular Expression

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  1. NSRegularExpression* exp = [NSRegularExpression regularExpressionWithPattern:@"(put)-(expression)-(here)" options:NSRegularExpressionSearch error:&error];
  2.  
  3. if (error) {
  4.     NSLog(@"%@", error);   
  5. } else {
  6.  
  7.     NSTextCheckingResult* result = [exp firstMatchInString:testString options:0 range:NSMakeRange(0, [productDescription length] ) ];
  8.  
  9.     if (result) {
  10.  
  11.         NSRange groupOne = [result rangeAtIndex:1]; // 0 is the WHOLE string.
  12.         NSRange groupTwo = [result rangeAtIndex:2];
  13.         NSRange groupThree = [result rangeAtIndex:3];
  14.  
  15.         NSLog( [testString substringWithRange:groupOne] );
  16.         NSLog( [testString substringWithRange:groupTwo] );
  17.         NSLog( [testString substringWithRange:groupThree] );
  18.     } 
  19. }

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