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TCValidation/NSString+TCValidation.h

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+//
+//  NSString+TCValidation.h
+//  TCValidation
+//
+//  Created by Ismail GULEK on 05/01/2017.
+//  Copyright © 2017 Ismail Gulek. All rights reserved.
+//
+
+#import <Foundation/Foundation.h>
+
+@interface NSString (TCValidation)
+
+/**
+ *	Returns true if the receiver string is valid for the given regex pattern and the number of matches for whole string is 1.
+*/
+-(BOOL) isValidForRegexPattern:(NSString *)pattern;
+
+/**
+ *	Returns true if the receiver string is a valid TC number.
+*/
+-(BOOL) isValidTCNumber;
+
+@end

TCValidation/NSString+TCValidation.m

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+//
+//  NSString+TCValidation.m
+//  TCValidation
+//
+//  Created by Ismail GULEK on 05/01/2017.
+//  Copyright © 2017 Ismail Gulek. All rights reserved.
+//
+
+#import "NSString+TCValidation.h"
+
+@implementation NSString (TCValidation)
+
+-(BOOL) isValidForRegexPattern:(NSString *)pattern
+{
+	NSError * error = nil;
+	NSRegularExpression * expression = [NSRegularExpression regularExpressionWithPattern:pattern options:0 error:&error];
+	if(error)
+	{
+		NSLog(@"Regular expression error: %@", error);
+		return NO;
+	}
+	NSRange completeRange = NSMakeRange(0, self.length);
+	NSRange rangeOfFirstMatch = [expression rangeOfFirstMatchInString:self options:0 range:completeRange];
+
+	//	returns true if complete string matches the pattern
+	return NSEqualRanges(completeRange, rangeOfFirstMatch);
+}
+
+-(BOOL) isValidTCNumber
+{
+	/*
+	 Rules:
+	 1. 11 hanelidir.
+	 2. Her hanesi rakamsal değer içerir.
+	 3. İlk hane 0 olamaz.
+	 4. 1. 3. 5. 7. ve 9. hanelerin toplamının 7 katından, 2. 4. 6. ve 8. hanelerin toplamı çıkartıldığında, elde edilen sonucun 10’a bölümünden kalan, yani Mod 10’u bize 10. haneyi verir.
+	 5. 1. 2. 3. 4. 5. 6. 7. 8. 9. ve 10. hanelerin toplamından elde edilen sonucun 10’a bölümünden kalan, yani Mod10’u bize 11. haneyi verir.
+	*/
+
+	//	Rule 1 & 2 & 3
+	NSString * pattern = @"[1-9][0-9]{10}";
+	if(![self isValidForRegexPattern:pattern])
+	{
+		return NO;
+	}
+
+	//	preparations
+	NSInteger digits[11];
+
+	for(NSInteger i = 0; i < 11; i++)
+	{
+		NSString * character = [self substringWithRange:NSMakeRange(i, 1)];
+		digits[i] = [character integerValue];
+	}
+
+	//	Rule 4
+	NSInteger sumOdd = digits[0] + digits[2] + digits[4] + digits[6] + digits[8];
+	NSInteger sumEven = digits[1] + digits[3] + digits[5] + digits[7];
+
+	NSInteger modValue = (sumOdd * 7 - sumEven) % 10;
+	if(modValue != digits[9])
+	{
+		return NO;
+	}
+
+	//	Rule 5
+	NSInteger sumFirstTen = sumOdd + sumEven + digits[9];
+	NSInteger modValue2 = sumFirstTen % 10;
+	if(modValue2 != digits[10])
+	{
+		return NO;
+	}
+
+	//	all rules applied, receiver is a valid TC number
+	return YES;
+}
+
+@end