Question

我有一个包含行的文本文件，类似于这些

000001 , Line 1 of text , customer 1 name
000002 , Line 2 of text , customer 2 name
000003 , Line 3 of text , customer 3 name
  =               =             =
  =               =             =
  =               =             =
000087 , Line 87 of text, customer 87 name
  =               =             =
  =               =             =
001327 , Line 1327 of text, customer 1327 name
  =               =             =
  =               =             =
  =               =             =

我可以编写一个程序来读取上述文件的每一行，将其转换为以下格式：

000001 , 1st Line , 1st Customer name
000002 , 2nd Line , 2nd Customer name
000003 , 3rd Line , 3rd Customer name
  =               =        =
  =               =        =
  =               =        =
000087 , 87th Line, 87th Customer name
  =               =        =
  =               =        =
001327 , 1327th Line, 1327th Customer name
  =               =        =
  =               =        =
  =               =        =

我的问题：是否有直接的方法使用正则表达式实现相同的输出？

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我尝试了以下内容：

Dim pattern As String = "(\d{6}) , (Line \d+ of text) , (customer \d name)" 
Dim replacement As String = " $1 , $2 Line , $3 Customer name " 
Dim rgx As New Regex(pattern)
Dim result As String = rgx.Replace(my_input_file, replacement)

但结果远远不是所需的输出。

请帮忙

Answer 1

你的正则表达式捕获太多了。这些组应仅捕获数字：

Dim pattern As String = "(\d{6}) , Line (\d+) of text , customer (\d+) name"

此外，由于您要使用序号替换数字，您应该使用String.Format进行格式化（逐行）：

Dim match as Match = rgx.match(my_input_file_line)
Dim outputLine as String = String.Format(" {0} , {1} Line , {2} Customer name", _
    m.Groups(1).Value, GetOrdinal(m.Groups(2).Value), GetOrdinal(m.Groups(3).Value))

其中GetOrdinal是一个将数字字符串更改为序数的方法。

Answer 2

你的匹配群体很大。你想要匹配的是数字。

替换(\d{6}) , Line (\d+) of text , customer (\d+) name
由$1 , $2th Line , $3th Customer name

然后将1th替换为1st

然后将2th替换为2nd

然后将3th替换为3rd

我不知道您是否有意与真正的裁判名称相匹配并以其他顺序替换它......是吗？

然后你可以使用（使用全局和多行标志）

^(\d{6}) , Line (\d+) of text , ([^ ]+) (\d) ([^ ]+)$

并替换为$1 , $2th Line , $4th $3 $5

提示：我总是使用http://www.gskinner.com/RegExr/来测试我的模式并尝试使用它们！

Answer 3

是否有使用正则表达式的原因？也许我误解了这个要求，但它似乎是一种修复格式，只有第一部分很重要，所以你可以使用这个简单的查询：

IEnumerable<string> lines = File.ReadLines(@"folder\input_text.txt");
IEnumerable<string> result = lines
.Where(l => l.Trim().Length > 0)
.Select(l => int.Parse(l.Split(',').First().Trim()))
.Select(num => string.Format("{0} , {1} Line , {1} Customer name"
    , num.ToString("D6")
    , num + (num == 1 ? "st" : num == 2 ? "nd" : "rd")));

您可以使用File.WriteAllLines将结果写入输出文件：

File.WriteAllLines(@"folder\desired_output.txt", result);

如何使用正则表达式将String转换为不同的子字符串？

3 个答案: