Following is the objective C code snippet to check that the 6-digit number is not repeated and not in sequence/reverse-sequence. I have just printed the proper messages in NSLog that user should be allowed or not: NSError *error = nil; NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@(?!(\\d)\\1+$|(?:0(?=1)|1(?=2)|2(?=3)|3(?=4)|4(?=5)|5(?=6)|6(?=7)|7(?=8)|8(?=9)|9(?=0)){5}\\d$|(?:0(?=9)|1(?=0)|2(?=1)|3(?=2)|4(?=3)|5(?=4)|6(?=5)|7(?=6)|8(?=7)|9(?=8)){5}\\d$)\\d{6}$ options:NSRegularExpressionCaseInsensitive error:&error];        NSRange matchRange = [regex rangeOfFirstMatchInString:text options:NSMatchingReportCompletion range:NSMakeRange(0, text.length)];        BOOL didValidate = NO;        if(matchRange.location != NSNotFound){            didValidate = YES;        }        if(didValidate){            NSLog(@Allowed);        }else{            NSLog(@Not Allowed);        }I just want to know if this regex has an effect on performance, and if yes, then what should be optimal solution for it. It would be great if anyone can provide their inputs for the same.
Checking that a 6-digit number is not repeated and not in sequence
regex;objective c;ios