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Xiaobian to share with you how to use regular expressions in iOS to determine whether the ID card format and bank card number format is correct, I believe most people still do not know how to share this article for your reference, I hope you have a lot of harvest after reading this article, let us go to understand it together!

1. Sometimes we will use the upload ID number, or bank card number, this time we need to ID number and bank card number, basic judgment.

The following is the judgment of ID number returning YES is legal, otherwise illegal

#pragma mark Judge whether ID number is valid- (BOOL)judgeIdentityStringValid:(NSString *)identityString { if (identityString.length != 18)return NO; //regular expression determines whether the basic ID number satisfies the format NSString *regex2 = @"^(^[1-9]\\d{7}((0\\d)|(1[0-2]))(([0| 1| 2]\\d)| 3[0-1])\\d{3}$)|(^[1-9]\\d{5}[1-9]\\d{3}((0\\d)|(1[0-2]))(([0| 1| 2]\\d)| 3[0-1])((\\d{4})|\\d{3}[Xx])$)$"; NSPredict *identityStringPredicate = [NSPredicateWithFormat:@"SELF MATCHES %@",regex2]; //If this verification is passed, the ID card format is correct, but the accuracy needs to be calculated if(! [identityStringPredicate evaluateWithObject:identityString]) return NO; //** Start checking *///Save the first 17-bit weighting factors in the array NSArray *idCardWiArray = @[@"7", @"9", @"10", @"5", @"8", @"4", @"2", @"1", @"6", @"3", @"7", @"9", @"10", @"5", @"8", @"4", @"2"];//This is the 11-bit remainder and Captcha that may be generated after dividing by 11. It is also saved as an array NSArray *idCardYArray = @[@"1", @"0", @"10", @"9", @"8", @"7", @"6", @"5", @"4", @"3", @"2"]; //It is used to save the sum of the first 17 bits after weighting factors are properly applied. NSInteger idCardSum = 0; for(int i = 0;i

< 17;i++) { NSInteger subStrIndex = [[identityString substringWithRange:NSMakeRange(i, 1)] integerValue]; NSInteger idCardWiIndex = [[idCardWiArray objectAtIndex:i] integerValue]; idCardWiSum += subStrIndex * idCardWiIndex; } //计算出校验码所在数组的位置 NSInteger idCardMod=idCardWiSum; //得到最后一位身份证号码 NSString *idCardLast= [identityString substringWithRange:NSMakeRange(17, 1)]; //如果等于2，则说明校验码是10，身份证号码最后一位应该是X if(idCardMod==2) { if(![idCardLast isEqualToString:@"X"]||[idCardLast isEqualToString:@"x"]) { return NO; } }else{ //用计算出的验证码与最后一位身份证号码匹配，如果一致，说明通过，否则是无效的身份证号码 if(![idCardLast isEqualToString: [idCardYArray objectAtIndex:idCardMod]]) { return NO; } } return YES;} 在接下来便是银行卡号的的判断返回YES或者是真是合法，反之不合法 #pragma mark 判断银行卡号是否合法-(BOOL)isBankCard:(NSString *)cardNumber{ if(cardNumber.length==0){ return NO; } NSString *digitsOnly = @""; char c; for (int i = 0; i < cardNumber.length; i++){ c = [cardNumber characterAtIndex:i]; if (isdigit(c)){ digitsOnly =[digitsOnly stringByAppendingFormat:@"%c",c]; } } int sum = 0; int digit = 0; int addend = 0; BOOL timesTwo = false; for (NSInteger i = digitsOnly.length - 1; i >

= 0; i--){ digit = [digitsOnly characterAtIndex:i] - '0'; if (timesTwo){ addend = digit * 2; if (addend > 9) { addend -= 9; } } else { addend = digit; } sum += addend; timesTwo = ! timesTwo; } int modulus = sum % 10; return modulus == 0;} The above is "How to use regular expressions to determine whether the ID card format and bank card number format are correct in iOS" All the contents of this article, thank you for reading! I believe that everyone has a certain understanding, hope to share the content to help everyone, if you still want to learn more knowledge, welcome to pay attention to the industry information channel!

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