Question

我正在尝试转换像

这样的字符串

"test",645,23.4,42,"13,13,14","test"

进入

"test","645","23.4","42","13,13,14","test"

我正在尝试使用此代码。

string pattern = "\",(? !\")";
string pattern2 = "(?<!\"),(? !\")";
string pattern3 = "(?<!\"),\"";
string replacement = "\",\"";

Regex rgx = new Regex(pattern);
catalogo = rgx.Replace(catalogo, replacement);
rgx = new Regex(pattern2);
catalogo = rgx.Replace(catalogo, replacement);
rgx = new Regex(pattern3);
catalogo = rgx.Replace(catalogo, replacement);

但我不知道如何超越已包含逗号的值。 "13,13,14"因为它会将其更改为"13","13","14"

我不知道这是否是转换字符串的最佳方式，但至少我相信它会完成这项工作，只是因为我不知道为什么我会过去这个。

Answer 1

我不确定为什么你需要使用正则表达式来解析逗号分隔的数据有很多免费的库专门解析这种数据，同一个.NET Framework在Microsoft.VisualBasic.IO命名空间中提供了一个特定的类

在这里你可以如何使用它

#import "TableViewController.h"
#import "TableCell.h"

@interface TableViewController ()
{
    NSMutableData *webData;
    NSURLConnection *connection;
    NSMutableArray *array;
}

@end

@implementation TableViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    // Uncomment the following line to preserve selection between presentations.
    // self.clearsSelectionOnViewWillAppear = NO;
    // Uncomment the following line to display an Edit button in the navigation bar for this view controller.
    // self.navigationItem.rightBarButtonItem = self.editButtonItem;
    // Get an array from web and Populate Check Arrays with New Data as above ...

    [self GetDatabaseData];
}

-(void)GetDatabaseData{
    NSURL *blogURL = [NSURL URLWithString:JSON_URL];
    NSData *jsonData = [NSData dataWithContentsOfURL:blogURL];
    NSError *error = nil;

    //NSDictionary *dataDictionary = [NSJSONSerialization JSONObjectWithData: jsonData options:0 error:&error];
    NSArray *TransactionArray = [NSJSONSerialization JSONObjectWithData: jsonData options:0 error:&error];

    NSDecimalNumber *check_total = [NSDecimalNumber zero];

    NSString *current_check;

    // Loop through Json objects, create question objects and add them to our questions array
    for (int i = 0; i < TransactionArray.count; i++)
    {
        NSDictionary *jsonElement = TransactionArray[i];

        // Accumulate if this is part of the same check.
       NSDecimalNumber *line_total = [NSDecimalNumber decimalNumberWithString:jsonElement[@"tran_value"]];

        // Decide if this is Element Belong to the Last Check number.
        if (jsonElement[@"tran_check"] == current_check){
            check_total = line_total; // Reset Check Total to be the Value of this Line on NEW Checks
        }
        else{
           check_total = [check_total decimalNumberByAdding:line_total];     //Add this Line Value to the Running Check Total
        }

        current_check = jsonElement[@"tran_check"]; // Make this Check number the Current Check for Totalizing.

        _Checknumbers = @[jsonElement[@"tran_check"]];
        _CheckTime = @[jsonElement[@"tran_hour"]];
        _CheckValue = @[check_total];
    }
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

#pragma mark - Table view data source

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
    return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    return _Checknumbers.count;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    //  UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"Cell" forIndexPath:indexPath];

    static NSString *CellIdentifier = @"TableCell";

    TableCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];

    int row = [indexPath row];

    cell.CheckLabel.text = _Checknumbers[row];
    cell.CheckValue.text = _CheckValue[row];
    cell.CheckTime.text = _CheckTime[row];

    return cell;
}

@end

此代码检索您的数据并尊重双引号中的字段，以避免解析这些字段的内容。然而，似乎你还希望每个字符串检索一个双引号，所以你需要第二个循环来读取缺少的引号

string t = "\"test\",645,23.4,42,\"13,13,14\",\"test\"";
StringReader sr = new StringReader(t);
TextFieldParser tp = new TextFieldParser(sr);
tp.Delimiters = new string[] {","};
tp.HasFieldsEnclosedInQuotes = true;

string[] result = tp.ReadFields();

foreach(string s in result)
   Console.WriteLine(s);

顺便说一下，我不建议使用这个类，免费库或自定义代码。在这些选项之间进行选择总是在成本（写入，调试，测试，文档）和性能之间进行权衡。如果性能是解决方案的一个关键方面，那么您需要使用来自FTP服务器的真实数据来测试很多东西。只有您可以执行的任务。

使用正则表达式和csv引用字符串

1 个答案: