NSString * reg = @"[0-9]+";//字符串正則表達式NSError *error = NULL;//錯誤對象NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:reg options:NSRegularExpressionCaseInsensitive error:&error];//匹配reg的正則表達式對象 

/**1 * 正則表達式匹配 * * @param string 在此字符串中匹配 * @param options 一般填0 * @param range 在此范圍內匹配 * @param block 在block內會把匹配到的結果逐個返回NSTextCheckingResult，通過此對象的range屬性可以查看匹配到的字符串的location和length，同過subString方法可以得到被匹配字符串 */- (void)enumerateMatchesInString:(NSString *)string options:(NSMatchingOptions)options range:(NSRange)range usingBlock:(void (^)(NSTextCheckingResult * __nullable result, NSMatchingFlags flags, BOOL *stop))block; /**2 * 正則表達式匹配 * * @param string 在此字符串中匹配 * @param options 一般填0 * @param range 在此范圍內匹配 * @param block 返回數組，數組內是每個匹配到的NSTextCheckingResult */- (NSArray<NSTextCheckingResult *> *)matchesInString:(NSString *)string options:(NSMatchingOptions)options range:(NSRange)range; /**3 * 正則表達式匹配 * * @param string 在此字符串中匹配 * @param options 一般填0 * @param range 在此范圍內匹配 * @param block 返回匹配到的個數 */- (NSUInteger)numberOfMatchesInString:(NSString *)string options:(NSMatchingOptions)options range:(NSRange)range; /**4 * 正則表達式匹配 * * @param string 在此字符串中匹配 * @param options 一般填0 * @param range 在此范圍內匹配 * @param block 返回第一次匹配到的NSTextCheckingResult對象 */- (nullable NSTextCheckingResult *)firstMatchInString:(NSString *)string options:(NSMatchingOptions)options range:(NSRange)range; /**5 * 正則表達式匹配 * * @param string 在此字符串中匹配 * @param options 一般填0 * @param range 在此范圍內匹配 * @param block 返回第一次匹配到的NSTextCheckingResult對象的range */- (NSRange)rangeOfFirstMatchInString:(NSString *)string options:(NSMatchingOptions)options range:(NSRange)range;3.NSString //- (NSRange)rangeOfString:(NSString *)searchString options:(NSStringCompareOptions)mask;//- (NSRange)rangeOfString:(NSString *)searchString options:(NSStringCompareOptions)mask range:(NSRange)searchRange;//匹配文本-(void)matchIn{ NSString *searchText = @"rangeOf77Str88ing"; //只能匹配一次 NSRange range = [searchText rangeOfString:@"[0-9]+" options:NSRegularExpressionSearch]; //拿到匹配結果 if (range.location != NSNotFound) { NSString * searchString= [searchText substringWithRange:range]; NSLog(@"range.location = %lu range.length = %lu", (unsigned long)range.location,(unsigned long)range.length); NSLog(@"String = %@",searchString); }else{ NSLog(@"沒有匹配"); }} 4、正則表達式示例代碼 NSString *summaryString = [NSString stringWithFormat:@"對%@題 錯%@題 | 任務正確率%@ | 作業平均正確率%@", questionRight, questionWrong, questionRate, taskRate];NSMutableAttributedString *summaryAttributString = [[NSMutableAttributedString alloc] initWithString:summaryString];// 正則匹配,匹配數字和百分號NSString *reg = @"[0-9]+|%";NSError *error = nil;NSRegularExpression *regex = [[NSRegularExpression alloc] initWithPattern:reg options:NSRegularExpressionCaseInsensitive error:&error];NSArray *array = [regex matchesInString:summaryString options:0 range:NSMakeRange(0, summaryString.length)];if (array.count) {for (int i = 0; i < array.count; i++) {NSTextCheckingResult *result = array[i];NSRange range = result.range;[summaryAttributString addAttribute:NSForegroundColorAttributeName value:[UIColor colorWithHexString:@"#e71419"] range:range];}}self.summaryLabel.attributedText = summaryAttributString;

//驗證是否存在-(BOOL)validateRegular:(NSString * )regular matchText:(NSString *)text;{ //正則表達式格式 //NSString* regular=@"^1[0-9]{6}$"; //創建謂詞 NSPredicate *numberPre = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regular]; //匹配字符串，若能匹配返回YES，否則返回NO； BOOL isMatch = [numberPre evaluateWithObject:text]; return isMatch;}