NSString *tenDigitNumber = @"1234567890";
tenDigitNumber = [tenDigitNumber stringByReplacingOccurrencesOfString:@"(\\d{3})(\\d{3})(\\d{4})"
withString:@"$1-$2-$3"
options:NSRegularExpressionSearch
range:NSMakeRange(0, [tenDigitNumber length])];
NSLog(@"%@", tenDigitNumber);
tenDigitNumber = [tenDigitNumber stringByReplacingOccurrencesOfString:@"(\\d{3})(\\d{3})(\\d{4})"
withString:@"$1-$2-$3"
options:NSRegularExpressionSearch
range:NSMakeRange(0, [tenDigitNumber length])];
NSLog(@"%@", tenDigitNumber);
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