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1. Regular expressions with NSRegularExpression

   Two methods to be added to a NSString category:

   -[NSString captureRegex:]

   - (NSString *)captureRegex:(NSString *)pattern {
   
       NSError *error = nil;
       NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:pattern options:NSRegularExpressionDotMatchesLineSeparators error:&error];
       if(regex == nil) {
           NSLog(@"-- %@", error);
           return nil;
       }
   
       NSRange rangeOfFirstMatch = [regex rangeOfFirstMatchInString:self options:0 range:NSMakeRange(0, [self length])];
       if(rangeOfFirstMatch.location == NSNotFound) return nil;
   
       return [self substringWithRange:rangeOfFirstMatch];
   }
   

   -[NSString matchRegex:]

   - (BOOL)matchRegex:(NSString *)pattern {    
   
       NSError *error = nil;
       NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:pattern options:NSRegularExpressionCaseInsensitive error:&error];
       if(regex == nil) {
           NSLog(@"-- %@", error);
           return NO;
       }
   
       NSUInteger n = [regex numberOfMatchesInString:self options:0 range:NSMakeRange(0, [self length])];
       return n == 1;
   }